One with a torque tube, made by GM.
It does not have a common name like a Dana 40 or a ford 9" or a Rockwell, or a GM 10 bolt.....
It's just a 51 1/2 ton rear as far as I know.
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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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-