Does your Benz specialty shop do its own transmission work? Mine all sub it out, either to a local tranny shop or they buy a rebuilt. I took my transmission problem to the best tranny shop in my area. Unless you're concerned about the tranny shop not knowing how to remove a Mercedes transmission? In which case I'm not sure I would trust them to overhaul it, either. There's no reason to pay a specialty Benz place at specialty Benz rates when the transmission shop will do it as part of the overhaul.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970