What is the width of that van axle compared to the original (which is about 63")?
It also looks like a semi float rear which I personally wouldn't want for a 3/4 ton or larger.

A full float "14 bolt" rear can be had the right width and with gear options to suit. I'm gearing up* for a 14 bolt swap myself and will document it well in the coming weeks.

Grigg

*pun intended

•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-