My 2000 MGM developed a curious vibration after an unintended "neutral drop" in a parking lot. I messed up my initial reverse from a parking spot just as someone else came along. After seeing this person was going to wait for me rather than go a different route, I went to put it in Drive to move forward, but the gear didn't engage. (I'm guessing the steering column could use new bushings.) I was feeling pressured from the other person waiting (it was one of those days), and as it happened, I ended up putting it into Reverse while the RPMs were up, though not too much. I heard a "bang" just before the left rear wheel spun (because it was wet; no trac lok).
I didn't notice anything the first time I went on the highway just after that. But while on a long trip during the wee hours with the cruise control on, I could feel a curious vibration in what I presume was the rear end while the car was coasting. The only thing that came to mind is some kind of damage to the reverse side of the diff gears, since driving forward under power is still smooth. The same problem was still there without cruise control on. I don't notice anything with city driving or reversing.
Is there some kind of obvious part or interface that might have got jostled or something? The only other thing I can think of is knocking off enough rust from the driveshaft to unbalance it, but that wouldn't seem to explain why the problem only shows up while coasting on the highway.
I didn't notice anything the first time I went on the highway just after that. But while on a long trip during the wee hours with the cruise control on, I could feel a curious vibration in what I presume was the rear end while the car was coasting. The only thing that came to mind is some kind of damage to the reverse side of the diff gears, since driving forward under power is still smooth. The same problem was still there without cruise control on. I don't notice anything with city driving or reversing.
Is there some kind of obvious part or interface that might have got jostled or something? The only other thing I can think of is knocking off enough rust from the driveshaft to unbalance it, but that wouldn't seem to explain why the problem only shows up while coasting on the highway.
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