Back to the 14 bolt rear axle swap for an AD truck.

Originally Posted by Grigg
The 14 bolt Cab and Chassis axle I have has 13" x 3.5" brakes for dual wheels. Drums I think are NAPA # NB 4401652
Napa # NB 4401651 is a single wheel drum with the same brake size.

To use the single wheel brake the backing plate will need about a 1-5/16" spacer between it and the bracket on the axle tube. Which gives this much more room between springs and backing plate.

One problem may be the two different drums in question mount differently. The single wheel drum is intended to slip over the hub, and the dual wheel drum is installed on the hub then the whole assembly is installed on the axle.
I expect that the single wheel drum can be installed first just like the dual wheel one was.

Grigg

I think I'll use single wheel drums and make new backing plate mounting flanges and weld them to the axle tubes in the proper place. That will make plenty of room for springs and u-bolts.

It'll be a while before I do this, but now having had plenty of time to think about it that's where I stand on the thought process.

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-