Any GM engineers out there? Guys who have built a Sky/Solstice, with an automatic, to 400 HP? I need to know how much power a 5L40E Automatic will reliably take before I think about upping the horsepower. I'm probably at about 320 hp/300 ft lbs of torque right now which, according to some information at Wikipedia, is more than the designed 250 ft lbs of torque it is supposed to take. The article does say for cars weighing up to 4000 lbs and, of course, the Sky/Solstice is way under that. But I'm concerned if I boost power to around 400 hp, the transmission won't take it. Anyone have any engineering information on this or real world experience with a Sky/Solstice automatic around 400 hp? Thx. I'll copy the Wikipedia article into the next posting.