But typically you don't have to muck up the interior to get any transmission in or out. even the shift linkage usually is completely disconnected and connected from the bottom side. To know if the 87 tranny will fit, a transmission shop should be able to give you an answer. Some transmissions five years apart will be a direct bolt up fit all the way. Then again, some will not fit at all, some will fit with minor modifications. You might use Sun Valley Parts as a guide to finding out also.
http://www.mercedesnewparts.com/start.wws?cookieID=24L0UKU7F24L0UPC2N&clientid=mercedesnewparts

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Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!