Originally Posted by
boostmonkey
The are the same transmission. NAG1. It's in a LOT of Mercedes and Chrysler vehicles. There are differences in the clutches and programming from model to model. The NAG1 has a reputation of being a very solid transmission actually.
The differences in clutch packs, solenoid's, and programming are what I'm talking about lol. I really want to retrofit the entire shifter assembly into an SRT. Sport, Comfort and full manual with the click of one button. Full manual if you're in Sport and click one of the button shifter's or slap the stick. It's smoother in comfort than the 722.641, faster and more abrupt in sport, and full manual actually works pretty damn good. I prefer it to Sport which is not the case with the .641 as you even stated.
And yes, they are damn near indestructible for the applications they use for each sub-model. Keeping the 32 motor the .641 has proven damn near indestructible. For the 55K's the .643 seems to be the same.