Our 1995 E320 trans is slipping
 

So this is how it goes its an auto by the way, Reverse Slips, 1-2 Goes in fine 2-3 slips but dose not slip once its in gear, 3-4 slips and dose the same thing once its in gear it wont slip, Oil filter has been changed, is there something beside replacing the transmission that i can do...

Front clutch(K1) may be worn/piston leaking. If this is a trans with lots of miles........................................

yes its has 202K miles