I had bias 8-19.5 tires all around on my 52 1 ton, when I was ready for a pair of new grippers I put a pair of radial 8R19.5 tires on the rear, and left the bias ply tires on the front.
Absolutely no problems, Put many hundred miles on it both loaded and unloaded, around town and on the highway, drove just fine.

I had also rebuilt (with about 8,000 miles by then) the entire drive-train, including new springs, pins, bushings, kingpins and bushings, steering box, tie rod and drag link. Not sure if this saved me form having problems or not, but the truck drove great with bias or the mix of bias and radials.

It never even occurred to me that there would be a problem having one type on the front, and the other on the rear, I could see a problem from side to side, but not front to back..

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-