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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
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#76456 04/18/2007 4:41 AM | Joined: Oct 2005 Posts: 83 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2005 Posts: 83 | I gotta 12 bolt rear in my 64 1/2 ton, and I figure this to have been a 6 cyl truck, so can anyone venture a guess as to my likely ratio back there? | | |
#76457 04/19/2007 3:19 PM | Joined: Nov 2004 Posts: 1,552 Shop Shark | | Shop Shark Joined: Nov 2004 Posts: 1,552 | 3.73 was the factory gear ratio in the C10 trucks of '64-'66. You can also check by removing the differential cover and counting the ring gears and pinion gears and dividing the larger number by the smaller number. This will give you the correct ratio of your rearend. I hope this helps.
Tony | | |
#76458 04/19/2007 4:25 PM | Joined: Sep 2003 Posts: 2,384 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 2,384 | As Tony says, 3.73 was standard, rare but optional was 4.10(usually behind 3 spd O/D) & the economy option w/3.07. Brian | | |
#76459 04/19/2007 6:01 PM | Joined: Oct 2005 Posts: 83 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2005 Posts: 83 | Thanks guys,
Sorry i didn't look harder at the archives though, this one was pretty well answered already. Someone said there was a stamp on the pumpkin somewhere that would tell me. Does anyone know where the stamp usually is? | | |
#76460 04/19/2007 6:49 PM | Joined: Sep 2003 Posts: 2,384 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 2,384 | Usually on top of the pass axle tube near the pumpkin, tough to find after 40+ yrs but it is there,,Brian | | |
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