I guess I should clarify a little. If you have a stone stock Mopar then you don't need to worry about any of this. Torqueflites were made to handle less than 400hp motors and when you stray from stock thats when you run into problems. Higher HP car have the ability to break the over running clutch. Most people put shift kits in their transmissions which enable you to "hold" a gear when they up the HP of their car.