Well,
Just measured my 52 axle and it appears to be a 53 and later as far as the spindle and bearings go.
Either it's a late 52 truck or someone swapped axles already?

If a rotor is going to slip on the original hub it'll need a 4.600" bore.

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
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-