Occasionally I feel what appears to be a shuttering effect when my 89 420 shifts from 2nd to 3rd. I am wondering if this is the beginning of the end or an easy fix. Fluid is fine, however, has not been changed for at least 30K. Thanks for help.

You need a modulator adjustment. If you have a lift available. Remove the rubber cap and pull the steel key out of the castelated top. Turn it in (clock-wise) one full turn and try it for a few days. Your shifts should be noticable firmer. One turn is a minor adjustment but if your problem is intermittant you are just on the edge and this adjustment should be enough.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician

Curious, why do you think it's the torque converter?

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Jeff L
1987 300e
1989 300e
1987 BMW 325

It is very rare for the torque converter to fail before the tranny on a Mercedes.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope :)
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM