I have both 48 Chevy and 53 GMC 2 ton front spindles and hubs laying around. Nothing older.

You can get a pretty good guess on the king pin size even without removing it.
If it's not 1.109" and 6.34" long like the 2 ton (and heavy 1.5 ton) has then it's should be 0.921" and 5.64" long as used in many 3/4, 1, and 1.5 tons.

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-