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They are used all over the engine accessories, brackets, etc. The support bracket for the compressor/power steering pump, the alternator - in fact the long pivot bolt on the bottom of the alt - they used a Nord-Lock under the head of the bolt AND under the nut on the opposite side. Seen a...

I would absolutely address this - S&S/BAE had to put nord-lock washers on everything (A1+) attached to the engine to prevent "normal" vibration from causing every bolt to back out. If there is any question about driveline balance I would pull them and have them completely serviced.

The driveshafts turn at a pretty high rate - remember with the 2:1 reduction hubs the driveshafts are spinning at twice the speed of a normal truck with 3.90 gears. So given that statement - do you believe the thump/shimmy/bounce is at the frequency of the drivelines, or at the frequency of the...