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You may only need to replace the rear mount. This wears out faster than the others due to oil leakage winding up on it. Oil attacks rubber. It's a LOT cheaper than the other 2 on your 740- they're hydraulic, this thing's just a big block of rubber.
If there's vibration at idle that goes away at say 1500-2000 rpm, I'd guess the front ones are bad too, but the rear is likely to be split or collapsed.
Good luck!
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Rob Bareiss, New London CT ::: '87 244DL/M47- 221K, 88 744GLE- 202K, 91 244 181K, 88 244GL 145K
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