while taking out my passanger side axle i accidently broke the tripot on it. I have an extra passanger axle laying around, can i just put that one on or do i have to replace them in a pair? only reason why i'm asking is with balancing things and such.

 

Nope, dont worry about it. I have never heard of having to replace both at the same time.

 

you can use the spare without any problems....only time it wouldnt be able to be used is if 1 car is a mtx and the other is an atx