Thanks alot man..sounds simple enough!  Now the question is where do I get 5.13 kick 3rd members without already having a spare kick?   
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try Trail Tough for used - I picked up one from them for mine

Thanks frank!  A buddy of mine found a whole rear tracker axle for $50.. Can I swap that in?  and do I need to change the front as well?

I'd just swap over the third member (diff) from the axle - I don't think the suspension mounts are the same and I'm unsure of the brakes and width.  You'll need the matching ratio for the front as well.  When you find the front, you'll want to grab the front inner axle shaft along with the passenger side CV/Axle shaft to make a hybrid one with your own.  This is needed unless you actually swap over just the ring and pinion (not what I'd recommend but can be done if you want).  There's nice instructions for doing the front end floating around on the board, try search "shift on the fly removal" or something like that.  If you can't find anything post up again and me or someone else can help out.

http://www.zukiworld.com/month_030104/feature_tsb_shiftontheflyremoval.htm 

The front axle parts must be from a jp-built 96-98 Sidekick, or (according to JayinBarrie) a Sidekick Sport (wherever built).

Well, I think you guys cleared it all up for me.. now the search is on for parts! 

thanks fellas,
James

The front axle parts must be from a jp-built 96-98 Sidekick, or (according to JayinBarrie) a Sidekick Sport (wherever built).

In the Shift-On-The-Fly-Removal article it say to use jp 96-98 and NOT the Canadian made 1.8L.  I was having trouble finding a Japanesse made 96-98, and I was finding lots of Canadian made 1.8L.  Maybe it's cause I live in the same province as the Canadian plant!!!

Nobody could say why I should not use the 1.8L, so I used the 1.8L diffs.  If you have a choice, use the Japanese, better to be safe then sorry.  If you can only find the Canadain 1.8L, use it. 

In regards to locker.  I bought a Lockrite to put in when I did the swap.  I was not clear that I was doing a swap and put in the wrong locker (96-98 vs +99).  I did not damage the diff, but did bust one of the locker spacers, and had to remove and go back to free spool.

Check out http://www.acksfaq.com/ and do a search for locker.  There's TWO write up's, one is the Lockrite install info, the other is a great write up on BACKLASH.  The Backlash article will help you a lot, way better pictures.  The housing that the ring attaches to for the 96-98 is different then the backlash article, but the main info is the same.