Best bet would be to find some 3800 dual wheel axles, front and rear. I don't recall how the front hub and or adapter works, parts manual should help figure it out.

18" tires are expensive now. if you did not use the truck much could probably find some old half used ones to last a while longer. New ones can be bought from a number of specialty tire suppliers. The 18" wheels are not odd or hard to find at all, most all AD 1 ton dual wheel trucks have them.

19.5" wheels and tires would be the way to go if you planned to use the truck a lot.

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-