Regarding the rear towing pump, I understand that some 722.3xx transmissions had it and some didn't. The purpose, as I understand it, was to be able to push start the car. Is this correct and is there some other purpose for this pump that is related to towing? Thanks.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles