I bought a pinion seal when I swapped gears. After running the new gears the pinion wasn’t leaking, so I haven’t replaced it.

The pinion nut is a special one, unusual thread I think. Mine is rusty, so without a spare nut on hand I haven’t been excited about pinion seal replacement either.

If yours doesn’t leak might also want to leave well enough alone.


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-