No, same size.

One difference is 48 model has a center rear cab mount. The later cabs have one mount each side of the frame at the rear of the cab. This is not a problem at all, but you may need to drill 4 holes in the frame to use the later type (better) mount system.

Another advantage to using a later cab is the gas tank will be in the cab, so with your original you'd have two tanks, twice the range.

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-