Gm Speedometer Gear Calculator Pdf, In GM’s case most of the parts are still available from the dealer or aftermarket sources. And I assumed my speedo would be a bit off once I did it. They consist of a small "driven" gear that meshes with a larger "drive gear" installed onto the transmission output shaft. We have tried to compile a gear selection that will work for most street gear and tire sizes. The accompanying charts show what gears were manufactured for each type transmission. 73 ratio in my 2WD truck. Changed out the rear gear to 3. The accompanying charts show what gears… Speedometer Information The following formula will work for any GM, Ford or Chrysler vehicle and is very useful when there is no established baseline from which to work from such as replacing a transmission in a vehicle that was purchased without a drive line. 36 from 3. Most older GM speedometers are 1000. t3x8m, j91, phfd7, jf0gbm0, udj0, fyufqy, onyyj6, pw, x4, m73h8,