I have a 4" lift with 4" shocks and stock control arms. I have the rugged ridge HD crossover tie rod kit, and an adjustable trac bar.

What I would like to know is; If I want to install a long arm kit, what else would i need to buy to make everything work?

 

you wont "need" anything else. you'll just have to cut the lower control arm frame brackets off.

 

Unless you get the 3 link longarm/hd crossmember kit I have which is high clearance and allows you to keep your stock control arm mounts on the unibody incase you would ever want to take the longarms off.

 

I was concerned the added flex of the 3 link would damage the 4" shocks...

 

Add limiting straps..