I wouldn't spend a dollar on repairing it unless you need and can use it yourself.
I suspect it's worth about scrap price unless the rest of the truck comes with it. The axle alone will be hard to sell.

•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-