Followup, I did swap it out with the rear and it works almost perfectly. The almost comes from the fact that it still gets off by maybe 1/3 of an inch by the time it reaches the top, but if you keep holding down the switch it'll correct itself when it hits the top.

Manual on the rear, good idea, since neither of my rear windows works that great (right not at all, left has a switch issue). Squiggledog had a good post about switching out to manual, though I remember he got his from a euro car...don't know if there are any around here. Might be able to buy them new or reman tho.

Thanks all

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1980 300SD Turbo Diesel
"Bailey's. Mmm...creamy. Soft, creamy beige." - Old Gregg