Just measured an AD 1 ton:
* Spring centers are 41.5" apart (with the springs as narrow as possible)
* Width outside of springs is 43.5"

Looks like spring pads need to be relocated 3/4" out per side.
Original drums to the axle should just fit around the springs, 3/8" per side.

Someone want to check my measuring on an AD 1 ton?

Thanks,
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-