Boy,,,, I don't know. I like the actual shifter in the cars I have, and the performance of the transmissions have never dissappointed me so far. As far as I know there are ways of playing with the smoothness of the shifts in the trannys already. I think I would pass on messing with stock.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K