same thing happind to my 88 190 2.3 . i am afraid to say your trans will need a rebuild or replacment . i just decided to covert mine over to a 5 speed manual using used parts from my local auto recyclers yard and a new clutch kit . it was alot cheeper then a trans rebuild . about $550.00 plus my own labor. compared to $800-1100 dollars for a rebuild . and the 5 speed is a much stronger trans then the auto.

sincerly,
Justin aka: mbluvrr

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mercedes = performance with lots of comfort !