The mounts have to be the correct ones I verified them off the site and it's hard to mess them up there stamped p and d for passenger and driver with arrows pointing which way they go my trans crossmember lined up perfect to the trans mount on the tail end so it's correct but fit was off where you drive the long bolt threw the reason for driveshaft being to short is probably the truck is body dropped and rear suspension travels I never jacked the rearend up to see where it's at in travel so I'll do that today