1962 gmc c20 rear gear ratio??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cag · 12-28-2023, 10:39 PM

v6 with speed, dana 60, any ideas on rear gear? no tag....

**Getter-Done** · 12-29-2023, 12:15 AM

Easiest Way to Determine Rear End Gear Ratio on a...

**cwcarpenter98** · 12-29-2023, 12:30 AM

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.

factorystock · 12-30-2023, 10:09 PM

4.10 would have been standard on a GMC V6. 4.57 would have been standard on a Chevy.

cag · 01-07-2024, 05:18 PM

thanks all yall!

**Getter-Done** · 01-07-2024, 07:35 PM

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

Inquiring minds want to know.

cag · 01-09-2024, 12:35 PM

Quote:

Originally Posted by Getter-Done

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,,,,,,

12-28-2023, 10:39 PM	#1
cag Registered User Join Date: Aug 2022 Location: winneconne, wisco Posts: 53	1962 gmc c20 rear gear ratio??? v6 with speed, dana 60, any ideas on rear gear? no tag....

12-29-2023, 12:30 AM	#3
cwcarpenter98 Senior Member Join Date: Jan 2018 Location: Hickory Flat, GA Posts: 4,488	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. __________________ 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

12-30-2023, 10:09 PM	#4
factorystock Registered User Join Date: Feb 2007 Location: west coast Posts: 3,395	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.

01-07-2024, 05:18 PM	#5
cag Registered User Join Date: Aug 2022 Location: winneconne, wisco Posts: 53	Re: 1962 gmc c20 rear gear ratio??? thanks all yall!

01-07-2024, 07:35 PM	#6
Getter-Done Senior Member Join Date: Dec 2009 Location: TN. Posts: 8,403	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. __________________ ________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build

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