Th350 speedometer ratio adapter When I bought it, it had a 1. If you already have a 19 tooth drive gear and don't want to change it, you could use the 43 tooth driven gear= 2. I did exactly as you suggested and it turns out that my ratio is . Pull the DRIVEN gear sleeve out of the side of the trans. Multiply the revolutions with axle ratio, A. With those 3 things, it is easy to figure out which DRIVEN gear you need. Made from high quality steel. It has a speedometer ratio adapter between the transmission and the cable question is, can I do away with the ratio adapter and attach the cable directly to the bullet insert at the transmissioncan change the gears for correct calibration??? Our website is currently getting a well-needed oil change, and getting those rims polished! Please check back soon. The pic of the book shows all of the possible ratios. For others that have to do this you can download a GPS speedometer app for your android phone that will give you the correct speed. Select options; SW41, 1993 – 1997 4L60E / 4L65E Mechanical Speedometer Kit $ 699. 00 and I’m not getting fat at that price. If you clean all the crud off the adapter you will find the ratio. Date tag still on transfer case, and tag still on rear diff cover. 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): Sep 20, 2021 · I have a 76 Sierra Classic with TH350 transmission. You can also adjust your speedometer with a ratio adapter. Aug 9, 2023 · All domestic ratio adapters are 7/8-18 thread, as for X38 and Ned’s comment on price the set up to cover 100% ratio change both plus or minus is not cheap nor are the new parts. Nov 11, 2020 · The stem on the Powerglide speedometer driven gear is longer than the TH350 gear so you can not use it. Aug 18, 2017 · Buy TH350 O-Ring & Seal Kit, Housing Speedometer Sleeve Adapter Bullet THM-TH-350/250/350C: Seals & O-Rings - Amazon. Drive Gears: Driven Gears: 7 teeth - pink: 18 teeth - brown: 8 teeth - black : Speedometer Driven Gear Calculator Driven gear tooth count = Drive Gear tooth count x Axle Gear Ratio x Drive Tire Revolutions per Mile (or 20168 / Drive Tire Diameter) / 1001 Popular Transmission Speedometer Gear Tooth Counts Transmission Drive Gear Driven Gear TH350 (Chevy) TH350 (BOP) TH400 200-4R 700R4 (4L60) C4/C5 C6 AOD 904 727 Muncie Saginaw Aug 30, 2011 · Re: ratio adapter « Reply #2 on: August 30, 2011, 11:16:44 pm » My 77 C20 had one on the TH350, however the PO had changed tire size and made the speedo read off by 12 mph. Multiply the gear ratio with the number of teeth on the driven gear, N. 00. Speedometer repair shops use to custom make those adapters. 07 rear. It has a ratio of 0. Start with a 20 tooth driven gear, its in the middle of the gear range. 00 Current price is: $ 139. Speedometer Gear Calculator - Monster Transmission 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. Mar 24, 2015 · You need a 3. This adaptor replaces worn out aluminum speedometer housings. Jul 30, 2013 · La Speedometer Gear 345215 Chevy TH350 type Bullet speedometer gear housing with oring and seal plus an extra seal kit LA Speedometer Gear 700r4 and BOP TH350 34 tooth gear and 2" housing LA Speedometer Gear 700r4 and BOP TH350 retainer, clip, 40-45 tooth driven gears, 15 tooth drive gear, and 2" housing Aug 15, 2018 · (10 tooth drive, 21 tooth driven) Digging into the ratio adapter, I discovered that the ratio was stamped right on the casing - in my case . Divide the product with 1001. 56) axle ratios where the "correct" gear was larger than the largest available. The speedometer has always been way fast. 02-10-15 04:50 PM - Post# 2522204 In response to raycow Thanks Ray. $ 139. 73 ratio. 9444/1 Ratio adapters for speedometers, wireline, slickline and other industrial applications. A mechanical ratio adapter is a small gearbox that takes the rotation of the output from the transmission and either slows it down or speeds it up using a couple of gears inside the gearbox. 093 ratio in your speedo gears and adapter. What you need to know is rear tire size, rear gear ratio, and the number of teeth on the speedometer DRIVE gear. 75. To calculate the number of teeth on speedometer drive gear: Divide the number 20168 by the diameter of the tire to find the number of revolutions per mile. Mar 13, 2010 · Multiply the ratio by the 0. Find Speedometer Cable Adapters and get Free Shipping on Orders Over $109 at Summit Racing! Jan 3, 2017 · Speed-O-Meter "Speedo" Bullet Housing Sleeve Adaptor TH350 - TH350C -TH250 -TH200 - Powerglide -Muncie -Chevy Aluminum housings tend to wear out and leak oil. I removed the adapter and screwed the speedometer cable directly to the transfer case. Dec 12, 2022 · 350/TH350 with NP205 and 3. 11 or 4. The gear ratio, G, is given by: G = A × R Toyota Truck Dual Transfer Case Kits; Orion Transfer Cases (Toyota L/C FJ40) Jeep Dana 18 & 20; Toyota Truck & 4 Runner; Toyota Land Cruiser FJ60/62, FJ80 Parts: Gear Sets and Gear Bearing Kits Sep 18, 2020 · If you want a very accurate reading of your speed, you can go to an electronic or GPS speedometer. com FREE DELIVERY possible on eligible purchases 54spk, Ratio Adapter Small Part Kit $ 24. Smaller Chevy TH350 driven gears (left) interchange with many GM manual trannys. Apr 6, 2018 · Kit includes:1 Heavy Duty Carbon Steel Speedometer adapter (with pre-installed seals) and a 2nd replacement set of seals to stop leaks in the future. It was the adapter! Feb 26, 2018 · A TH350-BOP/700-R4/TH400 uses the same large driven gears (right). 9743. It would be good to know what the speedometer head is from, and have it confirmed that the speedometer head is not broken. Another GM ratio adapter is #368022 at $117 list. The adapter screws on the speedometer connector on the transmission and the speedometer cable attaches to the adapter. Calculator for the right gear ratio on the speedometer. Now pick a drive and driven gear combo that gets you close to the new required ratio. 5%, and ironically, when I had done calculations to see how accurate the speedo was a few years back, I was coming up with about 2% discrepancy. 00 Select options Apr 17, 2023 · Certain tire size/gear ratio combinations require speedo gears that don’t exist. 00 Add to cart; Dodge / GM Ratio Adapter, Select the Speed Up Rate you need! Sale! $ 149. Some overdrive the speedo (if it reads slow) or slows the cable down if it reads fast. My price on new adapters is $110. Dec 28, 2010 · Front tire size doesn't matter. So, it's -2. 3 gear adapter which increases displayed speed. The ratio adapter can fine tune the speedo. 00 Original price was: $ 149. Oct 3, 2016 · A TH350 does not have a eccentric, re-position-able speedometer drive, that can accommodate a huge range of driven gear diameters like other transmissions do. These adapters were used by GM for high (numerically like 4. 77 reduction that you need to get the required new ratio. Synthetic Hi-Temp rubber exceeds OEM specifications and is designed for High-Performance, Heavy-Duty, Racing and Regular-Duty transmissions. 26 ratio, and will need a ratio adapter with 0. Note that if you can find two gears that get the right ratio, it will be cheaper than buying a ratio box. Feb 18, 2024 · TH350 O-Ring & Seal Kit, Housing Speedometer Sleeve Adapter Bullet THM-TH-350/250/350C Speedo Leak Stop Seal Kit for TH400 TH375 TH475 Transmission Speedometer Turbo 400 La Speedometer Gear 345215 Chevy TH350 type Bullet speedometer gear housing with oring and seal plus an extra seal kit On my truck, I went with a new Datcon (same parent company as Stewart Warner) electronic programmable speedometer that not only solves the calibration problem with the tire and gear changes, but it also solved the problem of snapping the drive cable at the hard bend next to the transfer case. AC Delco part numbers 15635472, 15636177 Aspect Ratio (1-100) Wheel Diameter (in) Tire Diameter (in) TH350 Speedometer Gears. kvcrhja aldci auhty bpimld aary jol lsuyntr zsaz tpei sozxyhy xmgvzppwn ufhc rkgwc opcvz ymyt