I looked in the 48-53 GMC heavy duty parts catalog again last night.

I was able to figure out that the cast adapters, both front and rear were only made to fit the 6 lug Budd hubs. So, at least from the info I have they were not made to fit the 10 lug on 7.25 bolt circle.

The adapters were apparently used on some 400 series GMC trucks.

Lets see some pictures of them on someones truck.
Now that we know they are out there.

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-