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Justin71105 · 10-03-2020, 07:03 PM

Pulled diff cover today to see what gears I had for my pcm tune.

Numbers on ring gear:

3817778 1141gm 1163 2 27

Comes back as a 3.73 built 11/1963, don't know the last designation.

May pull axles later on and verify they are the 17 spline, happy with gearing but want to find a mini spool to run or maybe even a posi unit. Looking now for a compatible one of each.

Found the fill plug under some sludge buildup, definitely have to clean out and refill.

10-03-2020, 07:03 PM	#16
Justin71105 Registered User Join Date: Dec 2019 Location: Greer Sc Posts: 216	Re: 1964 C10 fleet side swb Pulled diff cover today to see what gears I had for my pcm tune. Numbers on ring gear: 3817778 1141gm 1163 2 27 Comes back as a 3.73 built 11/1963, don't know the last designation. May pull axles later on and verify they are the 17 spline, happy with gearing but want to find a mini spool to run or maybe even a posi unit. Looking now for a compatible one of each. Found the fill plug under some sludge buildup, definitely have to clean out and refill. Attached Images __________________ 1964 C10 - Big window - resto-mod Last edited by Justin71105; 10-03-2020 at 07:36 PM.