hey guys got another question...I currently have a 4" procomp suspension lift on my '91 IFS pickup. i am planning on installing an add-a-leaf and 2" shackles for my sagging rear end and ball joint spacers for the front.. will i need to install longer shocks? thanks

 

Why not just get some 4" trail gear springs...?

The AAL is going to ride like ass...Ask me how i know..

You most likely will need new shocks..

 

why don't you use 63" chevy springs in da rear? flexs well and rides well. gives you about 4" of lift

 

I have a similar setup to your current one. I ran the AAL's but only because I had a shell. Without the shell it was way too rough. I yanked em after I took off the shell. Soo much better. If you're adding more than an inch and a half or so you will need it for the rear.