There are lots of good threads on this. It would be helpful if others would give you the best links - there are so many out there.

I had to disconnect the upper trailing arms in the rear in order to get the old spring out and the new one in out. But, Rob G. wrote up something once that explained how he did it without disconnecting the upper trailing arms.

Here is an explanation Chase gave me describing the rear suspension. It is helpful to know what parts people are talking about.

The sway bar runs parallel with, and is attached to the axle. There is a Link that runs perpendicular to the ground, that attaches it to the frame. The Control arms, or trialing arms, there are four, two upper, and two lower, they are attached to the frame, and the axle. There is a track bar, that is attached to the axle on one side, and attached to the frame on the other. Their functions are as follows...

Anti-Sway Bar; torsion style spring, that distributes load from side to side during cornering, also known for limiting articulation

Control Arms; do just that, they control the movement of the axle front to rear, and up and down...and SOME side to side...

Track Bar Controls lateral movement of the axle in Link type suspensions (2nd gen. rodeos fro example), in other words, they are responsible for the side to side motion.

Pete