I put the truck on jack stands, removed wheels and ran it in gear. Couldn’t find any noises like I was hearing when I tested it on my driveway. So I removed the differential cover and found this. How is the pinion gear rubbing on the carrier when I back off the gas? What did I miss during reassembly???
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1946 Chevy 1/2 ton "patina" pickup with a 1953 235 engine, otherwise all stock and unmolested!