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Re: 1962 gmc c20 rear gear ratio???
Put one piece of tape on the inside of one tire. Line up with an easily recognizable spot (or another piece of tape on the ground or inner fender. Put one piece of tape on your pinion yoke. Again, line up with an easily recognizable spot. I did mine with the pinion yoke mark pointed straight down to the ground.
Open Diff: Make two full rotations of the tire, count how many revolutions you have on the pinion yoke. Only lift one tire off the ground to do this.
Posi Diff: Make one full rotation of the tire, count how many revolutions you have on the pinion yoke. Need both tires off the ground.
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Christian Carpenter
1963 C10 - Frankentruck 283, Muncie 3 speed with overdrive Overdrive wiring here 1963-ish truck bed trailer - Half-Wit
1981 C10 - Penny 305, th350 --> Soon to be 350, Saginaw 4 speed
1995 Dodge Dakota Sport
"I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson
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