Built Auto guys

Go to www.tccoa.com and read the articles on the 4r70w automatic transmission. It can be modified to hold that kind of power. You can also do the "jerry mod shift kit" rather than buying a new valve body.

If you wish to have everything all in one with no rebuilding Lentech Transmissions and Performance Automatic are the places to look to. For a torque converter, Precision Industries Stallion converter all the way.

Shoot a PM to Jimfitzgerald. He is a member here and that is his user name. He has over 500rwhp in his supercharged 4r70w automatic. I know he has a PA valve body and some other stuff done but you'll have to ask him for the specifics.