ok my dad has a 200 xj with the rustys 4.5 lift on it with the fixed lower control arms wat would it do to it if i get him the uper control arms is that considered a long arm im confused about this

 

long arms are long arms, short arms are short arms. what is the confusion?

 

rustys has two diff. upper arms. if you have the fixed bottoms get the regular uppers, but why is my question the stock ones work fine

 

Long arms require a crossmember and extend back to the transfercase area. They allow for a higher lift and more articulation when flexed.

 

There are down sides to the stock arms, one being there weak, and most that pull them find that the center is rusted through to the bushing..

I'd go aftermarket uppers (Rusty's) if the fund are there. The stockers aren't all there cracked up to be..

 

Stock uppers can be reinforced if they are not too rusty. Cheapest thing to do is box them to make them a solid box.

 

then youll just blow through bushings and break either the mounts or the arms. theyre made to bend.

 

^^ I agree. Don't box the stock arms. Its asking for trouble. To the OP, If you already have fixed lowers, it might be an idea to get some adjustable uppers (depending on budget) so that you can have some decent castor adjustment. I've heard/read that its a good idea with a lift and by having the uppers adjustable instead of the lowers, you keep the threads, jam nuts, etc. up off the rocks.