hmmm.. how did ur friend shorten the other driveshaft? he repositioned the engine?? if in the same position then after shorten it wont be long enough to reach the knuckle right? hmmm.. interchanging tires? these tires were actually bought new though.. bought in nov.. this weekend might see if i can squeeze some time and exchange rims with my friend to see if the problem is still there.. btw, im trying to find out more information on on wheel balancing.. whats the advantage or theory behind it?y does it differ from regular wheel balancing..