i just installed a new tremec tko-600 and a denny's nitrous ready driveshaft, when i cruise in 4th gear with the driveshaft spinning in a "coast" state i get clunk clunk clunk hit the gas and it's fine, let off the gas and it's fine, what would cause that? i did not have this noise with the old driveshaft/tranny combo, could the pinion angle cause this?