I bought a 95 e320 wagon with slipping reverse gear and revived it successfully with redline seal saver, and it got a nice solid reverse that would back up strongly. But it would slip in forward gear if overfilled at all. Then I had to remove most of the fluid to very low..then add again to fill marks and it was okay again. Forward slipping caused lots of overheating but it never failed again.

Sold it after a crash in the ice/snow storm.

Good luck! Used a bunch of Lucas stop slip with no results, but the redline was very effective.