I see the picture but still unclear what's going on..
Reasonably sure you'll have a seal on the diameter just below the shoulder your arrow is pointing to.

You should find a service manual for your truck. One of the best tools a mechanic can have.....

Grigg

P.S. you know the rest of your axle housing is buried in the concrete floor right?? wink
What are you up to?


•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-