Axle from a C-70 is pretty huge. I feel you'd be better off with something smaller and with faster gears for a 1.5 or 2 ton truck. Perhaps a Dana 70HD or an 80.

Radiator should be sufficient for the 4-53T.

•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-