Originally Posted by Denny Graham
JD, as Grigg posted it sounds like the rear end was swapped out for a 3/4t. In which case it is most likely a 4.57 or could be a 5.17

Denny, not to be picky, but the ratio choices for factory AD 3/4 tons are technically 4.57, as you noted, and 5.14.

1 ton AD would originally have been 5.14 only, unless swapped with 3/4 ton R&P.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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