Several weeks ago, I backed out of a parking place and the car has not moved under its own power since. I pulled the B2 piston, it looked good, so I reinstalled it. Replaced fluid and filter at the same time. Still no go. Ran a couple of cans of sea foam trans cleaner through it. Still no go. Jacked all four wheels off the ground to check drive line, everything looks good. Started the car and put in gear, the rear wheels spun like they are supposed to except for reverse, which was still rotating in a forward direction. When I drained the fluid it was not burnt and had no solids in bigger than what would not go through a coffee filter. There are no leaks from either the front or rear seals. I have about run out of ideas,. short of overhauling the tranny.

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Dave
1983 300D Daily Driver