As Ed suggest.
Check out those axles discussed in this tech tip.
https://www.stovebolt.com/techtips/bigbolts/p30swap/

Your tape measure will guide you, but I'm thinking might be able to swap a newer front axle as is, no narrowing?
Rear axle is an easy swap if desired.

If swapping entire front axle is not measuring up then, or may be easier to start with, to swap just spindles, hubs, and brakes. That is discussed here:
https://www.stovebolt.com/ubbthread...4-1-1-5-and-2-ton-trucks.html#Post725027

Looks like it has 19.5" tires already, which is a nice upgrade from the tube type 18" or 20" it may have had original. Only thing better might be 22.5" but they're hard to find.

Grigg

(Edit)
Missed the torsion bar bit while typing up my reply.
May still be able to swap newer spindles or possibly entire axle and suspension

Last edited by Grigg; 07/25/2017 2:23 PM.
•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-