If i need to replace my front struts should I replace my back shocks also or should I wait till they go bad... and if I do should i keep the same brand on both or can I mix and match.

 

If you know and understand suspensions then you can mix and match left to right, front to back to get the correct valving and rates needed for type racing/driving you will be doing.

It's best for the common person and backyarder to buy matched sets.

Yes you can change front or rear and wait till needed for the other end.

In fact with mine I have nice KYB AGX adjustable rear shocks, and stock, old worn out V6 struts and springs up front on purpose to help weight transfer on the cheap as a street/strip drag setup.