We’re they greased?
You mentioned grease earlier, but did it get to the pins and bushings?

Possible wrong parts were used, or improper workmanship, or hole in axle was worn to start with?

•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-