I have a 87 190d na with 300Klms I put a 5 speed in it which makes it barely tolerable to drive. The automatic just sucked too much performance. You are talking a 2900lb car with 90hp. Check that the engine does not burn oil ie lingering blue smoke as you drive along. My experience is that the NA 2.5s had valve stem seal issues, seemingly the 2.5 turbo does not. Do not convert the AC to R134 as it does not work as well or last long. 3K is a bit pricey but if the car is cherry it could last you a long time, you just won't go anywhere very fast. Cheers Dan

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It's always something simple
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87 300D
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bunch of Onan and other diesel generators