Hey Alday, yeah I had my 300d trans
'rebuilt' some years back and about
25K later it began to slip when hot.
Could have been the clutches or particles clogging the filter or something else. I had Peter Schmid transmissions replace it
1800.00 in one day. Mountain View Ca.
They do trannys for many businesses in the Bay Area. Cut out the middleman.
Call Ian at 650-390-9500
Maybe he can steer ya right. Nice guy.

Why not re-examine the filter for particles?
Cheers

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1979 300D
133K miles
1989 300SE
1995 C280