The 48 1.5 ton rear frame is 36" outside, the C70 ought to be 34", not the same. A 400 series GMC would have a 34" rear frame, but not the smaller trucks.

•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-