After having the engine rebuilt, the guy who done the work never hooked up the tranny cooler so the fluid leaked all out. i drove it maybe 10 miles before i noticed the tranny acting weird. i immediately fixed the line and refilled with correct tranny fluid but now it shifts hard into 2nd and when held to the wood, it wont shift at all, just slips at about 6,000 RPM. Screwed tranny?