When my SL's tranny was recently rebuilt, we found the clutches were worn and/or flaking.

Replacing the clutches resolved the flaring.

Now it is only the delayed upshifts that are the problem.

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Don

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'90 300SL
'90 190E 2.6
'87 300TE (gone to car heaven)
'84 190D (passed along...still in the family and used on a daily basis)