Th350 Gear Ratio

The TH350 is lighter and doesn't eat up as much power. 55 for game-changing acceleration on the track. OER Parts offers a wide selection of All Makes parts, including All Makes interior parts and soft trim, All Makes exterior sheet metal, All Makes moldings, All Makes emblems, All Makes weatherstrip and unique accessories, to nearly every nut and bolt needed for installation. 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. This calculator is useful for planning your rig, allowing you to see what kind of performance to expect from different combinations. i have heard that the 3rd gear is the same ratio in the th350 and the 4l60e but im not sure. I am currently running a 3. The 6L80E has a gear ratio spread of 4. The Th400 has gear ratios very close to Th350s, so you won't notice a difference if you have the Th350 now. Call us at 1-800-592-9673 or 1-810-632-0400 and we will supply you with the correct gear or we will build a ratio adapter to fix the problem. Your salesman probably came from a Ford/Chevy dealership as they offer 3. 52 first, 1. The TH350 is a strong 3 speed automatic transmission. That is why you. Vote for your favorite Jeeps. 75 Ratio, Chevy, TH350, Set. 75 Ratio, Chevy, TH350, Set. 75 I didn't realize it but PATC has them too. Show Full Signature. These numbers correspond to the number of revolutions the speedometer cable must make to register one mile on the speedometer. 3 increase (MPG wise) of gear ratio over the Th350 in high gear. TH350 Automatic Transmissions in-stock with same-day shipping. This transmission had a lower first gear ratio, which was good for performance at low vehicle speeds, while the 30% overdrive provided significant fuel economy improvement. Engine Transmission Standard Ratio A/C Ratio Ring Gear Size 153 L4 3-speed 3. 27 gear, i was planning on trying that ratio out to start off and keep costs down. 1 - This is a retrofit gear to allow the speedometer to function with 3. Find Speedometer Gears with TH350 Transmission Type and get Free Shipping on Orders Over $99 at Summit Racing!. What rear gear ratio do you currently have?. New Process Gear NP435 - 4-speed longitudinal transmission used in a select handful of 67-72 GM pickups. Gear-Splitting is that feature which has made Gear Vendors so popular. The TH200-4R, like the TH350, uses a 27-spline input shaft. Miller says, “The gear ratio in your rear end determines how much load you are putting against the converter. Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. I have a 05' 2500HD 4 door, 4x4, 6. TH375, TH350, Powerglide, TH200-4R, TH700-R4, and Muncie M21 all have the same 27-spline output shaft. com (DBA Jam Performance Transmissions) which is a transmission company that builds and sells Tremec 5 and 6 speed transmission conversion kits. The number on the driven gear housing must match the number of teeth on the driven gear. The same is true of the transmission final gear ratio. I've done some research and there are ways of taking the KNOWN rear gear which is 3. 48 second and 1. A new speedo drive clip is included. Determine your engine's RPM based on the transmission gear ratio, tire height, MPH and the ratio of your ring gear and pinion gear. 75 Ratio First Gear 1. Not to be used in place of real testing. But the TH350 and TH400 three-speed versions (and their two-speed Powerglide cousin) fall short when it comes to highway cruising. Many of you have changed tire size or axle ratio on your car and now the speedo reads too high or low. I have a 700R4 in my '40 Chevy behind a strong 350SBC with 355:1 gears and it is a great cruiser. Transmissions play a very big part in the selection of a block to work with. There are 2 basic ratios,close and wide. While a vehicle with 4. The way that these transmissions are controlled is totally different. You currently have 0 posts. The sun gear is common (34 Tooth on each end). The driven gear is positioned in a removable housing that is typically located in the transmission's tailhousing. The five speed option is for the last gear of a transmission greater than four speeds. These examples don't take into account any torque multiplication may be occurring through the torque converter, they are just to illustrate the numerical gear multiplication. I ordered new drive and driven gear along with a new tail gasket/o-ring set. 1990 to 1993 the stock Ford production V-8 WC T-5 was upgraded with stronger 3. 73 rear in second gear in a TH350, which is 1. The 700R4's gear ratios are 3. This gear set upgrades the C6 to wide ratio specifications changing the first gear ratio from 2. It is a good idea to replace your speedo drive clip each time the gear is removed. 286 ratio brings the same close ratios found in a close ratio Muncie to your automatic. Gearing Calculator Here is a gear calculator you may find very helpful. TH350 output shaft with bearing that fits between case and ring gear Be sure you have the output ring gear to case bearing in the case. Please contact us to confirm correct vehicle fitment and usage. The TH400 has a 2. 0 for 3rd gear. 73, Reverse 3. These examples don't take into account any torque multiplication may be occurring through the torque converter, they are just to illustrate the numerical gear multiplication. This calculation is used to match oversize tires with new ring and pinion gears to obtain the desired engine RPM at highway speed. Most street driven 6 speeds and even alot of those track driven can't properly utilize all the gears and I myself am a fan of the 5 speed over the 6 speed and would only go to the 6 if I needed another gear. TH350 -- 35hp 700r4 -- 70hp 727 -- 40hp 904 -- 35hp E4OD -- 65hp If you have corrections, or gear ratios for other rear-wheel drive transmissions, please e-mail me with the info. Specifications for the 1976 Corvette, including dimensions, electrical, capacities, engine, and features. See the chart below the table for typical ratios. The downfall of this model is its cost when compared to the TH350, this is a more costly affair, making it more expensive to build up to higher power handling levels. At the bottom of the speedometer face, look for the numbers 940, 960, 1000, or 1020. 05-11-2006, 11:32 PM #6. Im just worried about it being a dog off the line with a 28" tire and a TH350 with a 3500 converter. 06 over with fuelie heads (68cc),. It is a good idea to replace your speedo drive clip each time the gear is removed. 286 ratio brings the same close ratios found in a close ratio Muncie to your automatic. Solve for your Transfer Case Ratio. Another car is using 2. It is about the only automatic transmission that will fit in a CJ-5 or shorter Jeep since the case itself with no adapter only measures 21 3/4". 0 for 3rd gear. I've done some research and there are ways of taking the KNOWN rear gear which is 3. When you lift your 4x4 truck you consider your options for lowering the overall gear ratio. TH350, Powerglide, and M21 all have the same length and output shaft spline count - therefore, no driveshaft mods required when swapping. Please contact us to confirm correct vehicle fitment and usage. That is why for instance an MGB with 14″ wheels was fitted with a 3. Gear Introduces Its New 10-Inch Gear Sets June 11, 2019 Lubrication Education: US Gear Covers What To Look For In Gear Oil February 9, 2019 Team OTSFF/MOTUL Heads to King of the Hammers as Guests of US Gear. This GM automatic was commonly found stock in vehicles from 1969-81. 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. This transmission was introduced in 1982 as a replacement for the TH350 transmission, with the primary goal of improving fuel economy. The size of rear tires and the transmission used will change the gear ratio needs. Ford F-150,F-250 , F-350. For more you may wish to check out: 4L60E VS 4L80E Differences TH350 vs. You will have a full 6 forward ratios and torque multiplication that will have even taller rear gears like 3. Conduct the 10 mile test, remove driven gear (the gear that spins your cable), count the teeth, and then multiply the teeth times the subtraction answer from the test. 10 gear set is for race applications. Their vacuum modulator idea for the 4L60E is among the worst 12 Jan 2016 The transmission speed sensors are used to calculate the actual gear ratio of the transmission while in use. 3 increase (MPG wise) of gear ratio over the Th350 in high gear. High rpms get to be annoying after a while [QUOTE=rod7515] What r the costs of changing the gear ratio in a vette. 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. And with so many gear ratio options available on the market to cater to the wide variety of engine combinations, tires, and race distances, this is a good problem to have. Leading provider of high performance automatic transmissions, torque converters and drivetrain components for race, street/strip, hot rod, street rod and towing. 10 with a 28" tire. To determine the correct gear ratio of the speedometer for your car, use the following formula to calculate the number of teeth on the driven gear (round to the nearest available gear): Use the following formula to calculate "tire revolutions per mile" for the formula above: With 15 Tooth Drive Gear. 69-86 1 TH350. I have a 70 half ton c 10 with the original 6cyl (250) and three speed tranny. There are 2 basic ratios,close and wide. What I could find is your rear end is a 3. Gear Ratio of combined transfer cases: 3. Then you will have an OD gear, and this will allow you to run a shorter rearend ratio (3. The extra gear in the TH350 is in front, the end gear ratio on the TH350 and Powerglide is the same. 42 max gear. I run a TH350 behind a 4. Wallace Racing BACK to Calculators Speedo Gear Calculator. The sun gear is common (34 Tooth on each end). 73 gears would be better with the way i drive, i'm always just cruising and never get to open it up. Look at the bottom of the speedometer face for the numbers 940, 960, 1000, or 1020. A new speedo gear set for Chevrolet Turbo 350 Transmission. To use the Optimal Axle ratio calculator, enter the tire size you are running, and your Estimated/Desired RPM through the trap in the Redline (RPM) field, then press Calculate, there will then be a pop-up requesting your Estimated 1/4 mile MPH, enter that and your Optimal Axle Ratio will display in the Axle Ratio field. 42 max gear. When using our sizing chart , please make sure you follow Steps 1 and 2 carefully. 7L 168-Tooth 1-Piece Rear Main Seal External Engine Balance Flexplate; TCI Chevrolet 5. The driven gears are color coded, too, and even have the tooth count stamped on them sometimes. Subject: gear ratio: Reply: Depends on how much hi speed driving you actually drive. 3-Speed Transmission Low Gear Sets ATI offers Low Gear Sets for most popular 3-speed transmissions. 06:1 for first gear, 1. :-\ I guess it will be some time before I get my hands on a set. 55:1 rear gear ratio to 2. Prior to the 10 bolt/12 bolt rear axles that came out in 1965, the axle housing was the same for all ratios. The way that these transmissions are controlled is totally different. The output shaft is splined to the rear planetary ring gear (66 tooth) and the front planetary carrier. The second row (in bold) is the stock gear combination for a 85-88 Monte Carlo SS with stock 3. Stall Torque Ratio 2. 52 second and 1. The gear ratios used for this transmission were 2. 8 ford rear end with a 3. 10 and higher rearend gear ratios falling in the 4-Series. When I changed the driven gear to a 19 tooth the speedo dropped to 56MPH at 50mph, when I changed to a 18 tooth driven gear the speedo was reading 53MPH at 50MPH so I was sure that a 17 tooth driven gear would be right on the money but it turned out the speedo. Turbo-Hydramatic or Turbo Hydra-Matic is the registered tradename for a family of automatic transmissions developed and produced by General Motors. Construction and Size The Turbo 350 transmission was a single piece transmission with the bell housing integrated into the transmission body. 75:1 First Gear Ratio- 2Wd CAr & Truck AppliCAtions - Full Manual ReVErse Pattern VaLVE Body * Wi This product may require vehicle validation(s) for proper fitment. 36 gear ratio would drive on the street. 10 rear end gears. Looking in the chart, I find the closest match (using a small drive gear and tailhousing) is an 8-tooth tailshaft gear and a 24-tooth speedometer drive gear. A three-speed helps a lot of guys get down the track, because it doesn't have the ratio drops that a Powerglide has. The program will compute the best driven gear given a particular drive gear, or the best drive gear given the driven gear value. 2" Torque Drive 2. In terms of taking off from a dead stop, the 700-R4 clocks in with a 3. While the TH400 is far stouter, it is longer and heavier than a TH350 and has a 2. To do another, enter a new set of values. The Gear Vendors offers a 22-percent overdrive, or the equivalent of converting a 3. This gives: 1. Details about TCI Automotive 312500 Drag Race Transbrake Transmission, TH350 TH350, Three Number of Gears, Trans-Brake Included Be the first to write a review. The standard gearing is: 2. Calculate GEAR, RPM, MPH, TIRE DIAMETER. 10) and you get the launches plus some good high speed cruising. give me a ratio and why do you think that's the best way to go Mild cams don't need as much gear, you. 52 first gear = 6. 52 to 1 low gear, and the TH400 low gear ratio is 2. Use our Differential Gear Ratio Calculator page to determine the best ring and pinion gear ratio for your vehicle. 3Vortec in my '37 Terraplane with 3. I've propounded in another drivetrain thread a few months ago that concerning the gears, a better indicator of gear stress isn't ring gear diameter, but pinion gear diameter. Once you know the ratio you need, look through the chart below to see which combination of speedometer gears is the closest match. Construction and Size The Turbo 350 transmission was a single piece transmission with the bell housing integrated into the transmission body. The rebuilt 350/TH350 trans got close to 20 MPG on the highway. La Speedometer Gear 3708148 Chevy TH350 type Bullet speedometer gear housing Retainer. This assumes no other changes such as tire or wheel size, engine changes or transmission changes. 75 I didn't realize it but PATC has them too. The transmission ratios in a 700R4 are different than a Turbo350, not to mention you lost a 4th gear when doing the swap. The TH350 is an automatic shift, three-speed transmission. ) Tire Height - In Inches, Use The Gear Calculator or Tire Size Calculator Speedo Revs/Mile - Number of RPM the speedometer needs to turn at 60mph You can hit the SAMPLE button to see how some typical calculations will look. Bowler and TCI sel la kit for the TV cable that makes the adjustment bulletproof and automatic. 68 Round to the nearest gear in this case it is 4. With a close-ratio box a driver can run through the gears and keep the engine in its power band so it performs in street racing or drag racing. You need to know your rear end gear ratio. No Tundra offers 3. TH350 question???? #909810 Tue Jan 08 2013 03 Have no idea what the gear ratio is. 74:1 First-gear ratio which is deeper than a TH350's ratio but not as deep as the TH700-R4's 3. 10 ratio, the pinion diameter is dangerously low in my opinion. 09/16/2007 1:30 PM: I think you do not quite understand here. To do another, enter a new set of values. Our Chevrolet GMC overdrive transmission provides 500 to 600 less RPM's plus 20% increase in fuel economy. 52 second and 1. actually the last 3 all have within 1/10 of each other. 3Vortec in my '37 Terraplane with 3. Call us at 1-800-592-9673 or 1-810-632-0400 and we will supply you with the correct gear or we will build a ratio adapter to fix the problem. Power is transmitted thru the front planetary ring gear (66 tooth). If you are looking for help with restoring or hot rodding your chevy classic a good place to go for help is Chevy Talk my favorite forum is 1955-1957 ( Modified / pro street / show) forum. NP205's came with a variety of input gears depending on application: 10 spline male: Common behind SM465 transmissions from the late 60’s through 1984. Transmission Gear Ratio Chart ~ Gear Ratios are listed for many popular transmissions. 70 gear, I don't feel comfortable pushing high crusing speeds, so I tend to stay off the interstates for extended periods. Enter the rear tire diameter Or use the tire selector above. There is a flat washer on the top of the crossmember and a heavy 1/4” thick flat washer and lock nut on the bottom of the elbow bracket. There are a couple for sale in my area but I'm not too sure what which would be the best. At the bottom of the speedometer face, look for the numbers 940, 960, 1000, or 1020. in stock format is the 350 the same strength?, or same. 55 gear ratios. 10) and you get the launches plus some good high speed cruising. Off road this lower gear ratio can make a big. It is a very HD wide ratio gear box that was never meant to be shifted quickly (it could live in a school bus for many years) as there is a lot of ma$$ in gears and iders shafts for beef and the wide gear ratios means a very large RPM difference between gears when you tach it up to 5000 RPM and you are not going to synchronize gear. 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. Stall Torque Ratio 2. com (DBA Jam Performance Transmissions) which is a transmission company that builds and sells Tremec 5 and 6 speed transmission conversion kits. With high performance cam. Chrysler and Ford speedometer gears are built into the outer shaft and can be used on any Chrysler or Ford transmission. It has been used in various GM cars and trucks over the years. 52 6 inch Tailshaft Dual piston apply feature on 2/3 shift to increase torque capacity Deep chrome pan adds 3 additional quarts of ATF B&M filter extension kit Torque converters available /// ALSO AVAILABLE \\\ TH350 9 INCH SHAFT TH350 4X4 TH350 6 INCH SHAFT TH350 BOP TH700R4 Chevy transmission transmissions 350 th350 thm350. All these changes can cause problems with accurate speedometer readings. Advance Adapters Atlas 4 Speed Transfer cases are built upon the industry leading Atlas 2 speed case with well over 10,000 units sold and are designed specifically for rock crawlers that need incredibly low gear ratios for slow speed technical driving. Axle Ratio/Tire Size Calculators **For Jeep or Chevy Technical Info see bottom of page Okay, so you've torn your pumpkin apart and have the ring gear and pinion gear teeth count. These transmissions mate a three-element turbine torque converter to a Simpson planetary geartrain, providing three forward speeds plus reverse. Here is how this works. With a 1997 Mustang V6, your car will come with an 8 tooth drive gear, which is incompatible with 3. 0 out of 5 stars 1. Use our simple Gear Ratio Calculator to quickly find the correct gear ratio for your ring and pinion gear set. Turbo-Hydramatic or Turbo Hydra-Matic is the registered tradename for a family of automatic transmissions developed and produced by General Motors. Check out this guide, which makes picking high and low ranges easier, on off-roadweb. The method of changing the transmission ratio does have the effect of adding gas mileage when applied with the right rear end ratio and engine tuning. 75 Low Gear Set. 94, rounding). For more you may wish to check out: 4L60E VS 4L80E Differences TH350 vs. The 700R4 goes from a 3. The Official Art Carr 2004R Transmission - California Performance Transmission stocks high performance 200-4R and 700R4 Automatic Transmissions, Torque Converters, Shifters and Racing Parts. My trucks ring gear is 10. 84 Ratio Revenger is Great for Overdrive Conversions in Hot Rods and Muscle Car's. Introduced in 1992, this was a replacement to the 700R4. Both the PG and TH350 have a 1:1 final ratio but the TH350 has the benifit of a lower first gear. It has an aspect ratio of 60, which is the ratio of sidewall height to section width. But the TH350 and TH400 three-speed versions (and their two-speed Powerglide cousin) fall short when it comes to highway cruising. In first gear, the TH350 uses both gearsets for a compound reduction. 33:1 comound low. the car will be driven in town 90% and raced at track 10%, fuel economy is not a concern. The TH350 is lighter and doesn't eat up as much power. Notes:Up to 775 horsepower with a non-supercharged system using pump gasoline. 0 for 3rd gear. TH700-R4 is 3" longer than the TH350 short tail. How To Build a High Performance TH350/TH400 Transmission February 5, 2019 Roadkill Customs How To & DIY DEBOSS Garage uses his ’67 Pontiac GTO project as an excuse to go over how to build a high performance Turbo Hydramatic 350 (TH350) or Turbo Hydramatic 400 (TH400) transmission…. Re: Powerglide or 3 speed? November 23rd, 2012, 10:34 PM 4. 43 final gear and the other has 3. The bolt pattern is the same as the earlier 3 speed transfer cases. 73 rear (assuming 29-inch diameter tires) is a 18-tooth drive gear and 35-tooth driven gear. The same is true of the transmission final gear ratio. Looking for some guidance in choosing a gear ratio for my build. Rearend gear ratio Transmission and DriveLine Questions. 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. 55:1 rear gear ratio to 2. These charts should help you narrow down the selection of the proper gear combination to use in the transmission and speedo cable to 'get you legal' again. actually the last 3 all have within 1/10 of each other. 73 rear in second gear in a TH350, which is 1. The reason no-one can tell you for sure is simple. These transmissions combined have gear ratios that are much closer to one another than their respective peers of the time. 7/TH350/NP241, Custom 4 link/ Radius Arms, ADS Nitrogen Shocks, 35" Cooper STT To view links or images in signatures your post count must be 10 or greater. Full product line coming soon to online store. Gear ratios Another big difference between these transmissions that are important to think of if you are going to swap them, is the gear ratios. 11 rear-3100+ cruising at 60mph. This chart has been revised with actual ratios. The sun gear is common (34 Tooth on each end). If these 2 steps are not followed, the sizing chart will print to the wrong scale and you will not be able to acquire the correct size you need. 8 has a 4:10 gear with a 27" tire. 1964-74 Camaro & Firebird Speedometer Gear 19 Tooth All Exc T400 Natural (TRN-1116) Transmission speedometer gear. These calculators are designed to give the approximate engine RPM (revolutions per minute) based on the ring gear and pinion gear ratio, the height of the tires (diameter from ground to top of the tire while mounted on the vehicle) and the transmission final gear ratio. TH350 Transmissions parts in-stock with same-day shipping. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Re: New close ratio gear set for 700R4/4L60E 1st 3. TH700-R4 is 3" longer than the TH350 short tail. Compare this to a TH350. The 350 transmission is 21-3/4" long and its one-piece case is cast of aluminum alloy. 23 rear diff ratio with a GV installed to get close to the highway rpm's I get now. 2" Powerglide 2. 08 and muliply by 20. Choose your rear axle gear ratio: Speedometer Gear Selection Select your transmission drive gear tooth count: 6 Teeth 7 Teeth 8 Teeth 9 Teeth 10 Teeth 11 Teeth 12 Teeth 13 Teeth 14 Teeth 15 Teeth 16 Teeth 17 Teeth 18 Teeth 19 Teeth 20 Teeth 21 Teeth 22 Teeth. The TH400 has a 2. Solve for your Transfer Case Ratio. This is fully loaded with trans and rear gear ratios. 56) axle ratios where the "correct" gear was larger than the largest available. 75 I didn't realize it but PATC has them too. 5" from front of 203 to ujoint center. With a close-ratio box a driver can run through the gears and keep the engine in its power band so it performs in street racing or drag racing. The maximum allowable voltage should not exceed 0. The standard gearing is: 2. It is also similar in length to the TH350 and the TH200, making it a natural for conversions where an overdrive transmission is desired. The gear ratios used for this transmission were 2. Call us at 1-800-592-9673 or 1-810-632-0400 and we will supply you with the correct gear or we will build a ratio adapter to fix the problem. Ratio Adapters, Speed Up or Slow Down your Speedometer. 94)) Pick your rear end gear ratio. Classic Industries offers a wide selection of All Makes parts, including All Makes interior parts and soft trim, All Makes exterior sheet metal, All Makes moldings, All Makes emblems, All Makes weatherstrip and unique accessories, to nearly every nut and bolt needed for installation. Shop TH350 Transmissions parts and get Free Shipping on orders over $99 at Speedway Motors, the Racing and Rodding Specialists. I bought th350 for my car and was wondering what rear end gear would be best for me and also would converter would be right? the car weights 3200lbs with me in it. These gears are an excellent alternative to steep rear end gears for street driven performance vehicles and low RPM, high torque race engines. 52 FIRST gear(TH350) for 2. I run a TH350 behind a 4. YJOTM August 19. 52 ratio and second gear is 1. Gear Ratios- The TH350's gears are placed closer together (despite having less of them). First gear at 2. Transmission Gear Ratio Chart ~ Gear Ratios are listed for many popular transmissions. Gear changes, transmission swaps and tire sizes. Use our Differential Gear Ratio Calculator page to determine the best ring and pinion gear ratio for your vehicle. TH400 Gear Ratios: 2. NP205's came with a variety of input gears depending on application: 10 spline male: Common behind SM465 transmissions from the late 60’s through 1984. Street / Strip - These torque-flite transmissions have a crisp shift but maintain full street capabilities. 84 Ratio Revenger is Great for Overdrive Conversions in Hot Rods and Muscle Car's. 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. 48 first, 1. Call us at 1-800-592-9673 or 1-810-632-0400 and we will supply you with the correct gear or we will build a ratio adapter to fix the problem. With a close-ratio box a driver can run through the gears and keep the engine in its power band so it performs in street racing or drag racing. 56 now I would only be able to go as low as a 3. I am turning 5200 this way. Purchase products to build your trans from the originator of the racing lightweight automatic in our online store. Transmissions play a very big part in the selection of a block to work with. Turbo 350 Performance Specs. 3Vortec in my '37 Terraplane with 3. This replacement gearset features a lower 2. The maximum allowable voltage should not exceed 0. Enter the rear tire diameter Or use the tire selector above. 0 for 3rd gear. I run a TH350 behind a 4. Call us at 1-800-592-9673 or 1-810-632-0400 and we will supply you with the correct gear or we will build a ratio adapter to fix the problem. The cost to replace the rear gear could also outweigh the cost of just replacing the trans. If you drive an automatic your RPMs will be slightly higher, and if you have overdrive your RPMs will be slightly lower. First gear ratio 2. Featuring Dataplate Column Gear Support available for purchase here. The input shaft for the 1992 Dodge NV4500 was 19 splines with a 1" diameter, like its predecessor, the Dodge NP435. TH 350 TRANSMISSION PARTS Mike's transmission uses only high quality components. 1978 Corvette Specifications - 1978 Corvette Spec Sheet. Installation of the correct ring and pinion gear ratio will help optimize performance, fuel economy and overall driveability. actually the last 3 all have within 1/10 of each other. This transmission had a lower first gear ratio, which was good for performance at low vehicle speeds, while the 30% overdrive provided significant fuel economy improvement. Conduct the 10 mile test, remove driven gear (the gear that spins your cable), count the teeth, and then multiply the teeth times the subtraction answer from the test. 48 in a T400 or a 2. TH400 Differences in the Way TH400 VS. the 700r4 has a 1. Solve for your Transmission Ratio. Unless driven gears with more than 45 teeth and / or drive gears with fewer than 15 teeth become available, it will be impossible without using a ratio adapter to have an accurate speedometer with rear end gear ratios lower (higher numerically) than 4. Firebird Central is a service friendly parts distributor specializing in 1967 thru 2002 Pontiac Firebird products. To make the swap easier is there a case number that I should be looking for? Or a specific first gear ratio? I'm looking to drive it around. This assumes no other changes such as tire or wheel size, engine changes or transmission changes. Using the example above, 255/60/15 means that the tire has a section width of 255 mm. Calculator for the right gear ratio on the speedometer. At the bottom of the speedometer face, look for the numbers 940, 960, 1000, or 1020. Please Click on the "Read More" link for additional details about this item.