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I have a problem that nobody can find. I hit some bumps or railroad tracks at 45mph or so and the Commander starts banging something in the middle bottom so hard that it shakes the whole Commander and sounds like something going to come through the floor. It sounds like a blown tire, but it's not. The only way stop it, is to throw the Commander in reverse drive back a little and then go forward and it stops. The dealer don't know what it is, since it won't happen while they had it and they checked everything out and it was fine. Anybody experience this?
 

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Sounds like the drive shaft gets wacked out of alignment by the bump. This could be cause by some damage at the ends of the shaft or even where it telescopes in the middle. Crawl under there and give the drive shaft a good shake or even a kick. It should not move at all. If it moves it could be a U-joint is messed up or the couplings at the end. Also try to turn the drive shaft by hand both forward and back. Either way it should have no movement at all.
 
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