Could be... When I pulled the 190 2.6's transmission to do the replacement, I did notice that the mainshaft plastic gear had a hairline crack... I replaced both grears along with all the associated rings and seals... not a problem again.

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MB roster
'85 500SE euro Ratrod
'92 500E's x2 / '94 E500 stored
'91 560SEC w/43K stored
'92 Cabby 16V OE 2.1 AutoX car
JDM RHD cars now.