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If it's an automatic, I'd look also at the tailshaft bushing of the transmission: there is a thin bronze bushing and an oil seal where the driveshaft exits the trans. Grab the driveshaft (car jacked securely, of course!) and push and pull. Any side to side play in the driveshaft at the trans means time for tailshaft bushing and seal replacement. About $40 in parts (list price) and maybe 1 or 2 hrs labor at a typical shop. Much less if they have the special puller tool for the bushing.
Also do the same for the differential. Any play in the rear axle means bad things- worst case changing a rear axle out. It's unlikely but not unheard of.
I would also look at engine and transmission mounts- they're often separated or about to fail due to the rubber being attacked by oil.
Also inspect exhaust hangers while you're under there- make sure especially that the exhaust doesn't hit the axle or the lower frame in the right rear of the car- this seems to be a tough spot for the exhaust shops to get right.
I had horrendous noise from my wife's 88 245 when we got it, on accel or decel, but not coasting. Turned out to be all exhaust noises.
LAst and probably least likely, there could be a worn rear wheel bearing. They can be pulled and inspected once the brake calipers are pulled off, as if you are replacing the rear rotors.
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Rob Bareiss, New London CT ::: 87 244DL, 88 245DL, 90 745GL, 84 242DL project, 89 244 parts, 88 244DL to replace the 87
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