I had the same tranny in my Prowler , the auto-stick thing, and it was JUNK. I would bener get a 08 Chall only because of the crappy auto.
Now the Getrag Viper spec 6 sp is one hell of a piece of work. The cool thing is it can easily handle 600-700 HP/Tq so we have alot of room to mod up our Challys w/o fear of blowing the tranny or clutch to pieces.

Now if I could just retofit my Getrag DCT from my E92 M3 V8 inot the Chally, WOO HOO