thud shifting from 1st to second
my car often makes a loud THUD when shifting hard near red line from 1st to second..i have an aftermarket aluminum driveshaft lingenfelter installed. What do u think this thud could be? and how come my tires arnt breaking loose instead.....somtimes both happens.....thud and they break loose.and somtimees they just break loose.....but MOST of the time it makes that thud ..its a god awful sound...other than that everything seems perfect with the car/tranny ..any suggestions???