In it's simplest form a 4-link suspension is 4 bars (links) that run from the frame, to the axle. They control things link how far forwards and backwards the axle can move, keep the axle located under the vehicle, control axle wrap, etc. Most of the 4-links i have seen run 2 bars from near the T.C. (one on each side) on the frame, to the rear axle, out near the tire, on the bottom of the axle, and 2 more bars from slightly farther forward, to the center of the rear diff, on top.
The triangulation (sp) keeps the axle from twisting, and sliding out from under the Jeep.
in this pic, you can see 3 of the 4 conections at the axle, 2 in the center, on top, and 1 on the rights side edge, under.
this pic is of the front axle, and shows the mounts on the axle, as well as teh frome, the outside bar mounts to the outside of the frame, so you cant see it.
I got all these pics from Fat City Offroad engineering, in Ventura, CA
there are more awesome pics @ http://members3.clubphoto.com/bj237292/Fat_City/
Of course it's hard, that's the point!!! If i wanted easy, i'd drive on the freeway.
FJ???? Does that stand for FAKE JEEP???