Now it is shifting funny, although I don't know what "normal" shifting is for a MB diesel. The 1st 2nd and 3rd 4th shifts are normal I guess, pretty hard by American and Japanese car standards. But the 2-3 shift is real hard, almost "banging" Like I said I don't know what normal is but this deffinitly does not feel right. I think it just started to do this but am not sure because I really have not driven the car much yet. So what could this be? The fluid looks fine a little dirty but not burnt, it is also a little overfilled. Would that do it? I'm a little ticked because I thought it shifted fine, last week I think it did.

Also has anyone ever tried Trans-X to stop a leak? My uncle swears by it, but I'm affraid it will losen stuff up and cause more harm than good. The car is a 1987 300SDL, I don't know the service history but the fluid looks good. I will be changing the fluid and filter in the next few days.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

A fluid and filter change with an adjustment fixed mine.

http://www.peachparts.com/shopforum/showthread.php?threadid=92268

When the ATF fluid level is low, it should shift hard and at very high rpm's. This happened to me when switching the tranny fluid to Mobil 1 synthetic. As I added more fluid, the shifts were softer and the shift points were at a lower rpm. I don't know what over filling might do but I would correct the fluid level and then see if the hard shifting still persists.

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold