Best Gear Ratio For Th400

Could use less gear or more motor but for mismatch parts it goes pretty good. ATI's Turbo 400 Drag Racing Transmission. The first gear ratio of a TH-700R4 is 3. *TSI T-400 All New Billet 2. 78-second ET at 98. Is it easy to do?. The gear ratio is not only affected by the axle, but also the tire size. Introduced in 1964, the TH400 is an automatic shift, three-speed, longitudinally positioned transmission. 50 Reverse gear - 2. what type of transmission does the 1978 Oldsmobile cutlass have and what is the torque limit because i have a Chevy performance ct350 and i don't if the transmission will hold in a race. DIY Extreme Duty 2-speed TH400 Transmission Conversion Kit! We love 2-speed TH400 transmissions here at Hughes Performance!! That is why we are excited to announce our all new part number HP2205 Do-It-Yourself Extreme Duty 2-speed TH400 transmission conversion kit!!. GM RWD Torque Converters Starting 1980-up, GM used a 4-digit ID sticker located on the converter body to help identify it. Let’s say you have a car with a 3. 43:1 (Close ratio) Turbo Hydra-Matic 400 - 1968 through 1977: Located on a plate attached to the vertical surface of the transmission case above the right-rear corner. The following information is what I've found out over time and what I encountered installing it in a 1979 Z28 Camaro. Call today for the right gear for your application. These are designed to replace a daily driver TH400 behind a stock or near stock engine and have increased service life due to our hydraulic, mechanical, and lubrication upgrades. 48 for 2nd, and 1. Note Automatic Transmission, Forward Shift Pattern, Automatic Valve Body, Chevy, TH400, Each. 1975 also marks the first year since 1964 that only one engine displacement size was available. This transmission has a universal bolt pattern which fits the Chevrolet, Buick, Olds, Pontiac and Cadillac engines of the mid sixties up through the 80’s. 58 in an efficient, lightweight Powerglide delivers the very best in performance and durability. 88 axle gears would have a crawl ratio of 3. The adapter material is 356 T-6 heat treated aluminum alloy and the adapter has a provision for a transmission. I could use some help in choosing the best rear end gear ratio for my 55 Chevy wagon. 11 gear ratio, high performance fuel pump, and a 1970's style TH350 transmission. This nearly equates to skipping from first to third gear with a manual trans. Ring-and-pinion selection made easy! Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Just type in your info (example: 5000 RPM), press calculate, and you’ll get the right ratio without the guesswork. 55 gear ratios, my bird has the 4. This has a real advantage for vehicles weighing more than 3500lbs. they are kinda spendy to build, but with quality parts and a builder who knows what they are doing they can hold up pretty well. trans type. The car had 3. Diff ratio is 3. I would stay with the 3:08, or maybe the 3:55but no more, unless you rarely go on the road with it. Two of the key reasons for its popularity were the improved fuel consumption and the 3. Let's take a look at a single planetary gearset. 12 X 38" = 4. 08 and I was careless putting it back in and snapped the plastic neck. Next, the first gear ratio of the 4L60e is quite deep, which presents a problem only because of the much shallower second gear. First off, most GM overdrives have a Fourth gear ratio of 0. Gear Ratio and Tire Size Chart NEXT PAGE This gear ratio and tire diameter chart is meant to give you an approximation of ideal RPMs at highway speed (65 mph) for three situations: fuel economy, every day driving and increased towing power. Muncie also had a second close-ratio transmission called an M22, which enthusiasts christened Rockcrusher; this was used in performance big-block engines and Corvettes and is a highly sought-after performance transmission today, and is the heavy-duty version of the 2. The gear ratios can remain as is for most of the other adaptions. The thing I like the most about the 5-speed is its Killer 6. they are kinda spendy to build, but with quality parts and a builder who knows what they are doing they can hold up pretty well. 64:1 (Wide ratio) HW = 2. 64 1st gear ratio T-10's in 1967 and early 1968 model production. with the TH400 vs. A web based calculator to help you pick the right size tires, wheels, rear end, gear ratio and transmission for your 55-57 Chevrolet. The 440-T4 was available with the following differential ratios: 2. It can also be used in lighter vehicles at power levels up to 800 hp and 800lbs. rockwell axles 6. 06:1) in the 700R4, you are in the right place. 78 would give me a final ratio of 2. 37 underdrive unit and 4. 75) for quicker acceleration and increased fuel economy at cruising speeds. 67 overdrive that gives you a 33 percent higher rearend gear. 57 Ratio Second Gear Planetary Kit; TCI Chevrolet 5. If installing a 1+2 in your present TH400 and leaving in 2nd gear you can manually shift the transmission if desired as it'll be in the 4 second range after launch. These should all be heavily considered before changing the existing rear gear ratio. Speed (MPH)x Final Drive Ratio x 336/Tire size (in inches) = RPMs Final drive ratio= transmission gear ratio (1. 64 1st gear ratio T-10's in 1967 and early 1968 model production. Not only will an Overdrive Transmission improve your performance, but it will reduce your fuel consumption by up to 33%. It shares many components and design features. 06) belongs to the GM 4L60/E family of transmissions. 73 posi 12 bolt rear end. by Michael Dickens The New Venture Gear 3500, a medium duty five-speed overdrive manual transmission manufactured by New Venture Gear, was used in General Motors and Dodge compact and full-size light trucks. Right now I am running about 2400 Rpm at 60. I promise you that the next transmission I have to replace or any other person I hear of needing a transmission I will be heavily promoting Monster Transmission and tell them that I personally use Monster Transmission. From heavy drag cars to off-road 4x4s to tow trucks, a TCI® Low Gear Planetary can improve low end torque without adversely affecting the final drive ratio. The New Venture Gear NV3500 at a glance. It would likely use a 3200-3500 stall converter, like PN109-603, to get the best performance. CT8344 - TH400 3L80 Speedo Setup Kit with 15 tooth drive and 34 tooth driven Turbo 400 Speedometer Housing, Gears, Seals, Retainer, Bracket Questions?? We can help calibrate what gears you need to work with this speedo housing! A new. 73 posi 12 bolt rear end. The TH400 also utilizes an electronic kick-down for the transmission; Lokar offers a kit to make this aspect of the conversion easier. ATI's Turbo 400 Drag Racing Transmission. 75) planetary gear set offers a 11% increase in 1st gear over the stock ratio. Modified high flow pump, forged steel gears and roller bearing, Vasco billet 7/8 input shaft, hardened forward drum, Vasco intermediate shaft, choice of 9310 Chromoly planetary gear ratio 2. The gear ratio you have out in that pumpkin under the backside of your car decides how your car will run in a few different ways - some of which you may not even be aware of. As a point of comparison, let’s compare that to the same effective First gear ratio with a TH400 trans that uses a 2. Switching to a 45-tooth driven gear (the most teeth available) would translate to the vehicle traveling at 78 percent of indicated speed - close but not perfect. Said the one he took out had it and the one he put in had 2:73 also. 5 way TRD LSD(3. The second constraint is: R = 2 × P + S That is to say, the number of teeth in the ring gear is equal to the number of teeth in the middle sun gear plus twice the number of teeth in the planet gears. As you can see it predicts exactly where in the rev range it will drop to so you can alter your gearing to keep the engine singing at the sweet spot instead of dropping down too low in the revs. 56 ratio to OVERDRIVE x 3 gear rear set 1. Right now I am running about 2400 Rpm at 60. This is ideal for the same 3,000-pound car with a 4. The Magnum Box is a planetary gear reduction box that bolts to the front of an NP205 transfer case. 000, 4 th-0. anyways, i was wondering, with a 383 stroker engine, what would be an ideal gear ratio for the rear end matched with an m-22? i would like to be able to use alot of the torque that the engine provides. As you may have read in the 4G6x section, there are two types of bellhousings available: wide and narrow. Best Chevy Automatic Transmission Online Buy Chevy Automatic Transmission on eBay now! At Floor Shift Console 1966 1967 Impala Ss Super Sport Caprice Gauges Woodgrain - $899. The gear ratio is not only affected by the axle, but also the tire size. These gears are an excellent alternative to steep rear end gears for street driven performance vehicles and low RPM, high torque race engines. If You Are A Beginner, This Is The Rear You Want To Start With. Question: Which Of The Following Gear Ratios Would Reduce The Output Speed Of A Transmission The Most? 3. Just tell him what you want to accomplish. But to tow with I would go with an even lower gear ratio to help. no gearing or shaft failure 15 years. Again, cubic inches, torque, vehicle weight and gear ratio have a big factor in this. I would have loved to go with a deeper rear gear but short of replacing the entire diff with a 9” or something I could not find a option deeper then 3. Simple guide to choosing the best diff gear ratios for your Jeep or 4x4 truck The correct chart for your gear ratio is important for drivability and economy. If you are only wanting to drive around town and do effortless burnouts, be "quick", and look great at the Wednesday night drags, then you'll want a set of gears that best suits that style of driving, which will be low gears. Those of you running a TH350 or other auto trans without lockup convertor or overdrive, whats your axle gear ratio and how does it do onroad and ocassional offroad?. New Process Gear NP435 - 4-speed longitudinal transmission used in a select handful of 67-72 GM pickups. By the beginning of the 80’s the th400 was retired by jeep and the introduction of the torqueflite transmissions was under way. Wouldn't matter on the highway. Bands and clutches hold the reactors stationary. This relationship is expressed mathematically. I would like advice on the following: 1. 78 over drive ,and as I have a 2. Get the best deals on Vintage and Classic Car Speedo Housing Retainer Bracket TH350 TH400 700R4 Speedometer Turbo 350 400 700 1 MOPAR SPEEDOMETER PINION GEAR. Let's say you have a car with a 3. Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. 7 ratio as above a t400 will be revving at 3262rpm. 11 and highway cruising like a 2. 10 Low Gear Planet *Counter tire spin in high horsepower GM TH400 drag racing applications *Improves take-off power by decreasing starting line gear ratio • CNC-machined billet construction for more concentric gearing system & improved durability • 6-pinion rear carrier designed to increase load capacity. If you've ever raced a vehicle, or driven a hot rod with an automatic transmission, high stall torque converter, an aftermarket automatic shifter, or performance enhancing shifting kit, thank B&M. There are many differences between the TH350 and 700R4 transmissions. 48:1 fi rst gear ratio, 1. Through the requisite TCI EZ-TCU controller, it's compatible with 'tap shift' button or paddle shifters as well. Simple guide to choosing the best diff gear ratios for your Jeep or 4x4 truck The correct chart for your gear ratio is important for drivability and economy. This is a discussion on Are gear ratio's fixed when building 4l60e or 4l80e within the Automatic Transmission forums, part of the Drivetrain category; Can someone educate me on the internals of automatic transmissions. 00:1 - 3rd TH350 and TH400 Performance Transmission Whether you have a stock engine or one that’s built-to-the-hilt, you don’t want to have an automatic transmission that just slides into gear. The following information is what I've found out over time and what I encountered installing it in a 1979 Z28 Camaro. The SuperGlide 4 is available with either a standard PG output shaft or the larger TH400 output shaft and most racers choose to upgrade their transmission to the TH400 shaft. Remove Axle Retaining Bolt. What is the best diff gear ratio for the following bakkie, i think at present it is 4. As you can see, adding the Blackbox to your drivetrain not only gives you a lower ultimate ratio, but additional ratios along the way. NHRA Pro Mod Charlotte: Big Congratulations Rick Hord and Carl Stevens on taking the Number 1 Qualifiers spot with his Xtreme Racing Engins powered Corvette by laying down the quickest turbocharged pass in NHRA history with a 5. I would stay with the 3:08, or maybe the 3:55but no more, unless you rarely go on the road with it. 06:1 gear ratio in 1st gear. History and operation of the Borg-Warner Overdrive Transmission. If installing a 1+2 in your present TH400 and leaving in 2nd gear you can manually shift the transmission if desired as it'll be in the 4 second range after launch. However, this means that the car is aMy '77, L82, 4-speed has a 3. Th400 1st gear ratio keyword after analyzing the system lists the list of keywords related and the list of websites with related content, in addition you can see which keywords most interested customers on the this website. cams pro magnum roller rockers (1. rpm = (mph x gear ratio x 336) / tire daimeter using this formula, whith my 72 cheyenne i am doing 2900 or so at 65. If we divide that 11. no gearing or shaft failure 15 years. 7 to 1 overdrive ratio making even 4. These types of gear ratios were used back in the days of modified production type racing, heavy 3600 lb camaros with motors less than 283 cids, and 4-speed trannys, just to help get the car moving. If you objectively consider the tranny and axle ratio and just how quickly first gear is over I think you will find you gut instinct to want more axle gear to be a bit outdated. But to tow with I would go with an even lower gear ratio to help. Crawl ratios in the 60's are quite capable; in the 80's, very respectable, in the 110's, impressive and anything beyond the 130's is usually considered the point of diminishing returns. Like my rear end build, the transmission was originally one of those things "Black art" and best thought as being left to the pro's. Buick called this transmission a Super Turbine 400 from 1964-68. I Currently have a 3. A gear vendors could be a risk as well. *TSI T-400 All New Billet 2. 705, Reverse-2. Shifts smooth with no issues, love it!. I personally believe 4. The electric kick down is much easier to set up, espescially if you are doing an LS Swap, They do both have an aluminum case, and three forward gears. What gears are good for highway driving on a Chevelle? im thinking about getting a 66-72 chevelle and i want to be able to drive on the interstate without any problems. Introduced in 1964, the TH400 is an automatic shift, three-speed, longitudinally positioned transmission. More power generally means less gear and less power generally means more gear if your car has the rpm potential to use it. See the install at Sport Truck Magazine. Choice of 9310 Chromoly 1. The more ratios, or speeds, in your transmission, the less severe is the tradeoff between gearing for best economy versus best acceleration. Use our Differential Gear Ratio Calculator page to determine the best ring and pinion gear ratio for your vehicle. Let's take a look at a single planetary gearset. FTI® TH400-2 - Level 2 Perfromance Automatic Gear Ratio Calculator FTI builds some of the world’s best racing transmissions and related components. Crawl ratios in the 60's are quite capable; in the 80's, very respectable, in the 110's, impressive and anything beyond the 130's is usually considered the point of diminishing returns. Searching for a specific manual transmission for your Jeep? View our Advance Adapters Manual Transmission Identification chart for 1987-2008 Jeep vehicles. 43 1st gear T-10. Like my rear end build, the transmission was originally one of those things "Black art" and best thought as being left to the pro's. 96:1 ratio reduction in low and 1:1 in high range, and a manual shift. Largest Main Shaft in the Industry. What is the best diff gear ratio for the following bakkie, i think at present it is 4. How do I request a Price Match?. Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Just type in your info, press calculate, and you'll get the right ratio without the guesswork. The car had 3. transmission will take over after that. Replacing a TH350 with a 700R4 Classic 67-72 Chevy/GMC Truck What rear gear ratio do you currently have? There are times that an x-tra gear would come handy. I have 1990 pontiac trans am with 355, the engine produced 420hp at 6100rpm and 425tq at 4200rpm. You'd be better off going to a 700R4 to get lockup and enjoy a. Orange = Best Overall, this is good mix of power/MPG and considered best for daily driving. 1" adapter plate between the two, somewhat similar to the TH350 adapter plate. using your info and a 28" tall tire, the rpm is around 3100 at 65. Also features a 2. The 700r4 driven gear is the same as a th400, which means if you re-use the speedo drive gear your speedo will read faster. Problem: Choosing a transmission, preferably one with *overdrive* capability, to mate to the AMC 401 V8. 00 for third, and 0. We took my car for a test drive but the transmission would not shift out of first gear. For example, a vehicle with a 4. What would be a good rear end/transmission for a 55 chevy with 427c. 1975 also marks the first year since 1964 that only one engine displacement size was available. cams pro magnum roller rockers (1. Turbo 400 with Trans Brake. If installing a 1+2 in your present TH400 and leaving in 2nd gear you can manually shift the transmission if desired as it'll be in the 4 second range after launch. hey guys, i am still turning over different ideas for building a good engine for my Z. My truck wont pull the mountain for shit in 4th. With my setup I have the same crawl ratio as other Commando guys running the stock TH400/Dana 20 with 4. Right now I am running about 2400 Rpm at 60. and my rear end a 10bolt and my tires on the rear are 275/60/15s what good rear end gears would be good for highway and street use and i dont race it i just want that extra punch for the street and good highway performance aswell something in the middle of both highway and street. I would have loved to go with a deeper rear gear but short of replacing the entire diff with a 9” or something I could not find a option deeper then 3. Includes preinstalled outer oring, inside rubber gear seal and metal retainer clip to prevent leakage. Materials and Size. Van Staal VS100BXP Black Spinning Reel – Expensive but nice - Gear ratio is 4. for example if one is 40 and the other was 11. Smaller diameter tire are just like lower gear ratios. This is ideal for the same 3,000-pound car with a 4. Gear Vendors Auxiliary Overdrive Units, increase fuel economy by 20%! GM Cars, Pickups and RVs with TH350, TH400 3 speed automatics. If you have a higher (lower #) gear than 3. Don't overlook gear ratios, as how the transmission will work with the rest of your drivetrain is very important when considering the efficiency and power transfer gains a transmission swap can offer. Last night we Jacked up one tire and spun it to see if we could figure out which. The front driveshaft will not receive power when in 2WD the transfer case is gear driven, 1. If the rear axle ratio has been changed or the trans originally came from a different vehicle, the governor calibration is probably off and should be changed. TH400 Gear Ratios: 2. Rearend gear ratio Transmission and DriveLine Questions. The New Venture Gear NV3500 at a glance. 9:1 for the first few feet of roll-out until the stator spins up to speed. The 1971 Monte SS (stock 454) currently has a TH400 trans and 3. Wouldn't matter on the highway. 70 and 1:00:1 That first gear ratio is known as the "Granny Gear". 56 = 1 to 1 New for 2015 Straight Thru Transfer Case Mated to a Power Glide or Turbo 400 Transmission. Only changes was the addition of Sanderson 2. The 1966 1/2 Rambler American Rogue with the 290 V8 had the 2. Gear Motors (Electric Bicycle Motors) Gear motors are made for electric bicycles with 16" through 26" wheels. Overall First Gear Ratio : 1 (Tranny Ratio x Rear Gear Ratio) TH400 has a 32-spline output shaft. The initial benefit is the addition of a 22-percent overdrive in high gear, but because the Gear Vendors can be engaged in any gear, it actually doubles the number of ratios available in any transmission. The TH400 automatic transmission is designed for Corvette big-blocks with engines rated up to 400 hp. Correct speedo gears will allow your speedometer to read properly. Enter the values on the left and press Compute, the gear calculator will take care of the rest. 059:1 while the 4L80e have the gear ratio of 2. " For OEMs, much the design strategy involves being able to use as many parts across as many vehicles as possible to keep manufacturing costs down and to minimize the chances of broken components in order to avoid. The 440-T4 was available with the following differential ratios: 2. 31 or something close. Last night we Jacked up one tire and spun it to see if we could figure out which. 07 axle ratio. 48:1; Second Gear - 1. I know a TH400 has an equall 1st gear, however second is like a 1. If you are only wanting to drive around town and do effortless burnouts, be "quick", and look great at the Wednesday night drags, then you'll want a set of gears that best suits that style of driving, which will be low gears. 10's are not highway friendly. Calculators. The "low-gear" (2. The following information is what I've found out over time and what I encountered installing it in a 1979 Z28 Camaro. To do another, enter a new set of values. A swap to a 6SPD 3. 5:1, 9th gear ratio of 0. This is what I have: and a better 1st gear. 56:1, pick the ratio you currently have or are planning to install. TH400 gear multiplication with a 3. They are pretty pricey, not that strong and you have to use a pedal/button to turn them on and off every time. Unlike other high performance transmissions builders, each individual transmission is built by one technician from start to finish. You may have to register before you can post: click the register link above to proceed. Good all around gear ratio for 454/TH400. 1 alumin bellhousing, deep aluminum pan and billet aluminum hubs. Your tire width is measured in mm. Rotate Axle To Line Up Hole In Axle Flange With One Axle Retaining Bolt. 48 first gear and 3rd gear of 1. 3 with a 4L60e tranny in my '49 Olds 98 convertible. I am building Muncie M21 & Rear Gear Ratio Advice Needed !!!!!!. 2 carrier would work much better for your expectations. It wouldn't make sense to spend a grand on a rear gear when a grand more could be spent on an overdrive with about the same final gear ratio. and I would like to go back to what was stock, and that was the 3. The TH400 also utilizes an electronic kick-down for the transmission; Lokar offers a kit to make this aspect of the conversion easier. 56 = 1 to 1 New for 2015 Straight Thru Transfer Case Mated to a Power Glide or Turbo 400 Transmission. They are available with four different gear ratio combinations with low range options down to. My '70 has the 2. Stock the gearing in this thing is more than an old 4L60E car with 4. Gear Vendors Auxiliary Overdrive Units, increase fuel economy by 20%! GM Cars, Pickups and RVs with TH350, TH400 3 speed automatics. ) in Inches. Enter R&P Ratio, Tire Height, Speed (mph), and Transmission Ratio, then click Solve to calculate RPM. A gear vendors could be a risk as well. 2(no turbo) with a TH400 and a np208(for now ). 55 gear ratios, my bird has the 4. For example, you could have the biggest motor you could stuff up front, but if you have a set of gears with a really low ratio number in the back, it'll move like a. 70 rear end. Enter Shift at RPM, select gear to shift to and hit Auto Shift to run up through the gears recording shift point RPM and KPH. Stock ratio is 2. Rated 5 out of 5 by JJH3 from 68 chevelle ss396 from powerglide to TH400 Went in easy, had to replace the drive shaft due to the length difference of the TH400 over the PG but no big deal. Again, cubic inches, torque, vehicle weight and gear ratio have a big factor in this. Have had a ton of Muncie 4 speeds go through my hands. 75) planetary gear set offers a 11% increase in 1st gear over the stock ratio. 43 1st gear ratios. Th700r4 is a 4 speed with a 4th gear ratio of I think. remember you're running this on a turbocharged engine that likes a little extra load. He'll advise you on the most appropriate ratio and build it if necessary. It's running a 383 engine with 10. available in cast aluminum or magnesium. These types of gear ratios were used back in the days of modified production type racing, heavy 3600 lb camaros with motors less than 283 cids, and 4-speed trannys, just to help get the car moving. Muncie also had a second close-ratio transmission called an M22, which enthusiasts christened Rockcrusher; this was used in performance big-block engines and Corvettes and is a highly sought-after performance transmission today, and is the heavy-duty version of the 2. 11 ratio gear set, quick release pro tree transbrake valve body, 9310 Chromoly input shaft choice of turbo or powerglide spline, 8 clutch high gear drum with wide steel hub, Kevlar band, Torrington roller bearing, deep aluminum pan, rollerized billet aluminum governor support, billet aluminum. 75) for quicker acceleration and increased fuel economy at cruising speeds. 75 Ratio First Gear 1. TH400 are stronger and heavier the the 350, they also cost more. 98 first gear ratio [3. 90 for the stock setup which just wasn’t deep enough so I was forced to go the trans route unfortunately. still buzzing and not too good for mpg. its very strong, and a little more expesnive to build than a TH350. With my setup I have the same crawl ratio as other Commando guys running the stock TH400/Dana 20 with 4. i never ran o/d on the 4r70 just so i wouldn't fry the bands if i nailed it and forgot wasnt bad around town on high way i just stayed. What gear ratio would be best for me to have? I still want to be able to run the truck on the freeway at like 65mph. What would you chose and why?. 06 ratio Second is a 1. It is widely regarded to be a supremely durable and legendary transmission. See the install at Sport Truck Magazine. The electric kick down is much easier to set up, espescially if you are doing an LS Swap, They do both have an aluminum case, and three forward gears. TH400: The Turbo 400, aka TH400, automatic transmission is a stout 3 speed automatic transmission. 7 to 1 wherein the 6 speed is like 2. This Built V8 is mated to a TH400 3 Speed Automatic Transmission equipped with a 3000 Stall Converter. Here is the long article on the 700-R4. your obviously going to need to consider tire diameter, rear gear ratio and transmission gearing, generally your want the first gear in the transmission multiplied times the rear differential gear ratio to fall in the 10:1-10. This load comes from both, the torque produced by the engine and the resistance of the vehicle to move from rest. My '70 has the 2. This set features a 6-pinion rear carrier for increased load capacity and. This model has a conservative rate of 450 ft. It shares many components and design features. I asked what gear ratio my truck had. This transmission was very popular and considered one of the best of ever produced. 97 2nd gear - 2. In addition to the 1 st gear torque multiplication, the torque converter also multiplies engine torque by perhaps a factor of 1. remember you're running this on a turbocharged engine that likes a little extra load. Right now I am running about 2400 Rpm at 60. if you EVER street or drag race your car go with 410's or 373's. We took my car for a test drive but the transmission would not shift out of first gear. 11 gears great on the street. Sonnax gear sets are a big step up from standard case- hardened and tempered varieties. 9bar)controlled by V-pro. To counter tire spin in high horsepower GM TH400 drag racing applications, TCI® developed a new planetary design that improves take-off power by decreasing starting line gear ratio. This is a much lower ratio than what was common, and provides good acceleration from a stop and is also good for off-road driving. 75 6L80E / 6L90E N/A 4. 2 inch diameter tires installed. You can also now calculate when using different transmission gear ratios, like in first gear or in overdrive. Example: If the driveshaft was rotated 12 times and the tire rotated four times, then that is a gear ratio of 3:1. Call today for the right gear for your application. This is a discussion on Are gear ratio's fixed when building 4l60e or 4l80e within the Automatic Transmission forums, part of the Drivetrain category; Can someone educate me on the internals of automatic transmissions. As you may have read in the 4G6x section, there are two types of bellhousings available: wide and narrow. This chart has been revised with actual ratios. Best axle gear ratio for chevy 350, TH350, 33" tires. I'm running a '68 L71 427 w/ISKY Z89 solid cam, TRW 11:1 forged, dimple rods, stock steel crank, closed chamber rectangle port heads, comp. would be. 90:1, and installed 26-inch tall tires. This extremely stout gear set features new E9310 gears (eight pieces), a new forged ring gear a new forged planetary housing, 9310 pins, and new washers and needle. Are gear ratio's fixed when building 4l60e or 4l80e. If this makes sense to you, take a look at our 4L80E options below. rockwell axles 6. Gear Ratio and Tire Size Chart NEXT PAGE This gear ratio and tire diameter chart is meant to give you an approximation of ideal RPMs at highway speed (65 mph) for three situations: fuel economy, every day driving and increased towing power. This set features a 6-pinion rear carrier for increased load capacity and. The question I have is what is the best gear ratio for my set up? Its got a naturally aspirated 6. Stock ratio is 2. available with or without neutral. 10 will be much better if you tow often. 08's presently. 90 The aftermarket's premier 6-speed performance manual transmission 700 lb-ft. chevyclassicsclub.