Frank,
I have made this swap into my Gen I. Here's what you need.

Short version;
Rear axle, drive shaft flange and bolts that bolts to the third member, the four doughnuts and compressor with it's components.

Long version;
The whole rear end including the drive shaft flange that bolts up to the third member and the bolts. No need to get any of the ABS stuff or the sensor cable for the locker CPU. Leave the panhard rod on the axle, less dis-assembly that way.

The compressor under the rear seat including the metal panel it is mounted on, get the connector along with some of the cable that mates to the compressor. Get the air hose or you can add new. You don't need the locker switch as it's the momentary type. I used a aux light switch for mine.

The 4.636 gears should be the same as your Gen I, so you don't need anything from the front end.

Get everything ready for the install as I know you will.

To install, change the drive flange (brain failure here can't remember the name of the flange) from the SR to the Gen I drive shaft using Mitsubishi universal joints.

Remove the Gen I rear and replace with the SR, using your springs if you are happy with them. Everything bolts up the same except use the rubber doughnuts from the Gen I for the trailing arms, 1/2 may work, you'll see. Hook up the break line. Cross the brake cables and reroute. Run +12 volts to the compressor from your new switch you have installed somewhere. Bleed the brakes.

That's it, you'll have a locker anytime you flip the switch. Drive around a corner to see if it makes a differences. <img src="/forums/images/graemlins/lol.gif" alt="" />

Next up get some fender flares from JCW like I did. <img src="/forums/images/graemlins/smile.gif" alt="" />