For what year?
There are numerous different ways to do it.
Take a stroll through a junk yard with your tape measure and see what looks suitable.

I used an IH Scout II steering box and a different axle on my 48.
Next time I'll look at a PS gearbox from an imported cab-over truck.

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-