Then you must start with a P30 I-beam axle with 5/10 lugs and disc brakes. Or much of the components from a 3500HD I-beam axle will work just the steering is more complicated. The P30 as a donor is preferred as it has similar to original steering arms.

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-