suspension problems

I'm new to the forum, and have been reading all about death wobble and bump steer. I have an 01' Wrangler with a 4" Skyjacker lift, & 33" BFG's. I've had the Jeep for 5 years, and never had this problem before. I'm not a mechanic by any means, but I "tinker", so I took the jeep in to the shop...

I've got a '73 CJ5. I cannot get the suspension to move more than a couple of inches from rest. There's a complete fiberglass body kit on it, but it would seem that whoever put that on (previous owners) did many of the modifications to the Jeep, all of which were done well. My question is-...