Jon is right about the crush washer. If you have been driving it up to the point you shouldn't have any issues. Must MFR recommend only using the pinion nut once, they designed like a lock nut. Flush everything out really good and you should be fine.

~ Craig
1958 Viking 4400
"The Book of Thor"
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1960 Chevrolet C10
"A Family Heirloom"
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'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)

If you don't like driving yourTruck, you won't drive yourTruck..| Living life in the SLOW lane