*TH350 Speedometer Drive Gears 7, 8, 9, and 10 Tooth (CHEVY ONLY)
#68X-Drive. TH350 Speedometer Drive Gear. Comes in 7, 8, 9 and 10 tooth gears.
|7 Tooth||8 Tooth||9 Tooth||10 Tooth|
Speedometer Calibration Variables such as the vehicle’s axle ratio and tire diameter affect the accuracy of the speedometer. Look at the bottom of the speedometer face for the numbers 940, 960, 1000, or 1020. These numbers are the number of revolutions the speedometer cable must turn in one mile of travel. Your speedometer may or may not show a number. Most speedometer from 1965 on use 1000.
To determine your tires true diameter in relation to determining what speedometer gears you need, measure from the ground up to the center of the axle then multiply by two. The actual run out of the tire can be as much as 2 to 3 inches less than what the circumference of the tire measures. In effect your tire has two diameters.
To determine your rear end ratio, raise both tires off of the ground, turn both tires at the same time one complete turn, at the same time count the turns of the drive shaft, this is your ratio.
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