First of all, BE SAFE, and support the car with multiple jack stands, and prevent the car from rolling. Work on a flat surface if possible.
Tips:
*** use loctite on the driveshaft bolts, and tighten ALL bolts to spec ***
- remove/loosen the panhard bar while the car sits on its full weight; remove the driver side bolt and larger passenger side bolt, and loosen the upper nut on the passenger side but you dont have to remove it. Get the panhard loose at least on one side before raising the car, because once you raise it, it'll put tension on the panhard bar, making it hard to remove.
Generally, removing the rear end is pretty simple.
After removing the panhard bar (on one end at least), raise the car and support it properly. Remove the back tires, remove the brakes, caliper brackets, abs sensor if you have it, and rotors (assuming they all are swapping over to the other rear end). Disconnect the 4 driveshaft bolts at the rear-end only (do not need to remove the driveshaft); you'll need a 12-point 12mm box-end or socket (or both!); the bolts will be tight so you may have to hold the driveshaft from spinning with a bar or screwdriver or something.
Use a jack under the pumpkin to raise the rear end, lifting it up some but not so much as to raise up the car. Remove the UCA nut (passenger side above the pumpkin), using a 21mm deep socket or similar 21mm wrench. Once the nut is loose, raise or lower the rear end to take some of the tension off the UCA bolt, but the spring-loaded UCA will want to pull upward, making it tricky to get the bolt out; you can tap it gently but dont drive it out if under a lot of tension as it can damage the threads.
Once the UCA bolt is out, loosen the shock bottom nuts and remove the bolts (15mm). Lower the rear end a little more, pull the springs out. Remove the 2 LCA bolts (18mm). That's it, it'll come out!
Put the other rear end back in opposite: get the LCA bolts in place loosely, put the springs in, get it raised up and get the UCA bolt in (which will be a bitch with the stock UCA); connect the shock bolts. Tighten the LCA bolts and UCA nut to 129 ft-lbs; shock bolts to 75 ft-lbs.
You should be able to lower the rear end now, which will make connecting the driveshaft easier. The driveshaft may have to be pushed inward (compressed) or pulled out, to fit to the flange.
IMPORTANT: use blue or red loctite on the driveshaft bolts, tighten to 85 ft-lbs. (you don't want them to come loose, which w/o loctite, they can come loose!).
Reinstall brakes (rotor, caliper bracket, pads and calipers), and abs sensor (if present).
You can put the panhard bar back in if you raise up the rear end pumpkin, so the holes line up; get the driver side end in first, or you'll be redoing it
Tighten panhard large bolts to 129 ft-lbs.
I left out the rear sway bar, but remove/re-install it as appropriate.
Use blue loctite on UCA, LCA, shock, panhard bar, and brake caliper bolts/nuts.
Make sure you have the right tools before getting started. Good luck
