On my 300D T, when I put it in L, it does not stay in 1st gear but shifts through all gears as if it's in D, same thing if I put it in S. That's not the way it should behave?

What's wrong and what's the remedy? Thanks!

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Most likely shift linkage bushings. One on each end. About 2 bucks a piece and will make it feel new. Search on installation. Thanks

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83 300D 227,xxx miles, sold
86 300 SDL 130,000 miles, sold

This is most likely the problem. However there are two more shifter bushings located inside the car where the shifter connects to the pivot that connects to the external shift linkage. When these go bad the shifter feels really sloppy. Their not that bad to replace. You'll need a cir-clip removal tool though. Its a really really difficult clip to remove without the tool.

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1981 300SD 512k OM603