High HP Auto trans which one?
There are other options though....4l80e, 200r4, few others...that if built right can hold...
My son just tore up his STOCK A4 with his 550RWHP and 615TQ and I will be heading out to Larry's tom. to talk to him @ that as well.
I also have heard good things @ Speed Inc. and High Performance Associates trannies. So there's lots of good options.
I vote Speed Inc. if you are going to go 4l60e...they did my T-56 to TH400 swap, I was the first they have done, and its still good to this day after about 4500 miles on it...just need to make some shifter adjustments...
it's my daily driver <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

