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I had this problem on 2 dash-9s. I tracked the problem down to the drive shaft. The weight of keyed part of the shaft throws the shaft out of balance when the engine was in motion especially around curves. I also noticed the key would rub on the electrical pick-up leg attached to the truck. I replaced the shaft with (I think) an a-line dog bone u-joint kit & a peice of rod on each end. Runs much quieter now.
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