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Old 12-28-2023, 10:39 PM   #1
cag
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1962 gmc c20 rear gear ratio???

v6 with speed, dana 60, any ideas on rear gear? no tag....
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Old 12-29-2023, 12:15 AM   #2
Getter-Done
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Re: 1962 gmc c20 rear gear ratio???

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Old 12-29-2023, 12:30 AM   #3
cwcarpenter98
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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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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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Old 12-30-2023, 10:09 PM   #4
factorystock
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Re: 1962 gmc c20 rear gear ratio???

4.10 would have been standard on a GMC V6. 4.57 would have been standard on a Chevy.
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Old 01-07-2024, 05:18 PM   #5
cag
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Re: 1962 gmc c20 rear gear ratio???

thanks all yall!
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Old 01-07-2024, 07:35 PM   #6
Getter-Done
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Re: 1962 gmc c20 rear gear ratio???

So,?
Did you find out what Ratio you have?
And how did you go about it?

Inquiring minds want to know.
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Old 01-09-2024, 12:35 PM   #7
cag
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Re: 1962 gmc c20 rear gear ratio???

Quote:
Originally Posted by Getter-Done View Post
So,?
Did you find out what Ratio you have?
And how did you go about it?

Inquiring minds want to know.
maybe in the spring,,,,,,
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