This transmission is the single biggest item on the LS that keeps it from being a first class car. I am not exaggerating when I say this transmission is junk. I make an input, put my hand back on the wheel and count thousand one, thousand two and sometimes thousand three before the junk responds. Pull up to a stop after any kind of driving, mellow, hard, cruising etc, light changes, nail it in SST 1st and it starts to go....but only like it's in second gear, "thousand one, thousand two, thousand three, thousand four" (the whole time the throttle at the same 1/4 to 1/2 travel position) before you get the right torque and the type of acceleration just about any other car I've had gives you at "thousand one". Cruising steadly and pop it down a gear too quick and it springs forward again and thinks you shifted down then up, slide it over from drive to SST and drop it one 'gear' and thousand one, thousand two, and often thousand three before the junk does anything. It's just about useless in Auto, and only just marginal in SST. Love the car, HATE the transmission. Not fond of the idea that there were no options either.
It was also a real great feeling one day of having no fourth. For around an hour it was not there, in SST, it Auto, down shifting in Auto, downshifting from 5th in SST. But of course that went away before I could get a dealer to witness it. Hasn't happened since but has put a dent in the confidence level of the car.