The original frame fits quite well, you could find another.

More info on why you need to, or want to, replace the frame and what you're after in the end will help you get more applicable answers.

Also curious if your 52 1 ton really has a 173" wheelbase? I would have guessed more like 137"

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-