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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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#65884 09/18/2006 1:43 PM | Joined: Jun 2005 Posts: 887 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 887 | Pull the cover and look at the ring gear. Somewhere along the edge you'll find a series of numbers. Two of those numbers are for the teeth on the ring and pinion gear.
My GM 12 bolt has the numbers "7 GM (six numbers) 11 41 s 02" stamped on it.
11 pinion teeth to 41 ring teeth means a 3.72 ratio.
Good luck!
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
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