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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!
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| | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | Ok, got me puzzled here. Many GMC 1/2 tons of that vintage had a Spicer 45 rear end. The Spicer 45 is very similar to a dana 44. It would Not have a dropout 3rd member. Some GMC's got the chevy rear end, which was made by Eaton. This rear end would have a very round cover bolted to the back and a dropout 3rd member in the front. Both these axles would have a 6 lug wheel pattern.
Possible ratios for the Spicer rear are 3.08 or 3.92.
Possible ratios for the Eaton rear are 3.38 (after market), 3.90, and 4.11 | | |
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