Two likely suspects are shifter bushings and neutral safety switch. Switch is mounted on the left side of the tranny, the bushings are on the shift rod (correct term?). The switch shows as "not available " at Fast Lane, so call Phil there--he should be able to get it. Thirty dollars more or less. Shifter bushings should be a dollar or two total. Easier to put the bushing in while the switch is out anyway. Do a search on those two items, and there are some really good details on the job, better than i could write. Good luck

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Earl McLain
'02 C230 Kompressor
'89 560 SEL "Frau BlueCar" (retired April 2004)