Didn't bearings change about 51? Spindles are a little smaller on earlier trucks... That just from memory, though I have researched and posted all the bearing sizes I can't search for and post the link right now. See what you can dig up.

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-