2000 Buick Lesabre. At around 120k the transmission was replaced with a used one. Vibration appeared a few YEARS later. We put on new tires, balance, alignment. These were needed anyway.
There is a vibration under load (hard acceleration/load is worse).
If you coast at any of these speeds it is NOT present or significantly reduced. Vibration reminds me of a wheel badly out of balance but seems to be more centered in the driveline.
Another owner recently described a vibration (same year/model w-similar mileage) that may be the same. Is there anything common to look for on these?
Well, with the amount of miles, and not feeling it for myself, this may be caused by a worn engine mount or transmission mount. A worn mount under heavy load can give what feels like a driveline vibration.
May also be a worn axle CV joint. These are a little harder to diagnose. Removal of axle and feeling for loose joint or stiff joint may be required. Also, check for axle being loose as it goes into the trans. This would indicate a worn bushing in the transmission.
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