i got 1987 ford mustang gt, 293 horse, i have NO clue why it won't spin on a dead spot. even if im rolling like 1 or 2 km..it won't spin.i don't understand..i have to be a t stop with my foot on the brake..and hit the gas and let the brake go then it will spin..its stupid..i mean i have lotsa of upgrade, and i shold have no problem roasting the tires of this ****. but im not sure. any ideas i thought it is something inn the drivetrain but need advice.i don't want to change evertything and waste thousands of dollars on rear end or tranny. thanks