Are you planning to run dual type wheels or single wheels?
Whatever brakes you use need to fit in the wheels, so check that before deciding what combination of parts you'll use.

Spindles should be the same for both single wheel and dual wheel trucks.
You mention an adapter, like a wheel spacer. If that's what you have try just installing it and see what works.
I think 3B's advice is about swapping a complete dual wheel hub, not using your existing hubs.

Last edited by Grigg; 01/11/2014 6:54 PM.

•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-