Ok here goes.

Ring and pinion of your choice. I belive the gear selections for gm 10 bolt go from 3.42, 3.73, 4.10 and then on up from there. Richmond gear makes a nice kit that includes everything needed, its $325.Richmond Gear 49-0041-1K - Richmond Ring & Pinion Packages - JEGS

Locker of your choice, make sure it is for the correct rear end. The 99 and up 10 bolts have bigger axels in them so just make sure you get the correct Differential for your housing.

If you do not buy the Richmond kit mentioned about the you will also need. Pinion bearing for your application, crush sleeve, carrier bearings. 3 quarts of gear lube, ( I strongly suggest Royal Purple or Lucas fully synthetic).

For added strength a girdle cover is suggested. LPW makes them along with a few other companies. These are the aluminum covers with the pre load bolts for the carrier bearing caps. This helps even the load on the carrier bearing to reduce stress and strenghten the caps to keep them from walking around and destroying your gears.

Hope this helps when your ready to get ur stuff just send me a pm and we can talk it over to make sure you have everything you need.

Thanks Brian