ok before you guys get on me about bad shifting i know this is terrable but im still used to diving ford powerstrokes and they act different. anyways the otehr day i downshifted i forget what gear but as i did i slowly reved up the motor and started easying the clutch out thing is i did get the rpm up enough and the engine didn't just freewheel up to it as the clutch engaged(the powerstroke thing) anyways when my clutch enaged it slowed the tires so much that the started squeling now this happened at about 30 mph and it seems to me a 6200 lb truck going 30 would put alot more pressure on the clutch then what it could hold and would slip. but it didn't not that i could feel. so my question is, is thing thing stock like the guy said he thought it was or is it an aftermarket. is there any not so labor intensive way of checking. thanls in advanced