Argh, well I made a list of everything needed a while back and that can be found in the search but here some info anyway.
You will need:
1) Axle with 32.5" spring pad width (78-79 Ford or any GM). You can use 10 bolt, dana 44, or dana 60. If you want to keep your stock t-case you need the ford versions of the 44 or 60 for the drivers drop. If you don't mind swapping t-cases you can put in a 241 pass. drop or a 205 pass. drop and run a GM or Dodge axle.
2) You will need spring hangers, I used
ORU's kit and highly recommend it, very nice brackets.
3) Springs from sfa 1/2 ton chevy. I used BDS at first and later had custom Alcan 4" packs made. Anything more than a 6 or 7" spring will be stiff, and the brackets add 3" of lift so if you have a 6" spring you will have a total of 9" of lift.
4) You will need to deal with steering, if it's a dana 60 you can go with
ORD's steering arm, draglink, and pitman arm. For a dana 44 or 10 bolt you can still use ORD's draglink and pitman arm but you will need to source a flat top pass. side knuckle and a steering arm.
5) You will need to extend front driveshaft, and possibly rear shaft.
6) Brake lines, you will need longer ones, I get my stuff through
AFCO.
7) Rear lift, you will need to take care of lifting the rear. You can run a 4" shackle flip from ORD and then whatever spring you need, I ran the flip and 4" Alcan springs.
8) Next is your tires/wheels which is up to you.
9) And last is something hardly anyone ever does but I highly recommend it. Your truck comes stock with a small master cylinder with a quick takeup valve made for the stock low drag calipers. When you put on the solid axle it will have normal calipers and the quick take up valve will cause increased tire wear. I recommend replacing the MC with the unit sold as the "Brute Force" mc by ORU. Then remove the ABS unit completely and replace it with a proportioning valve from an older SFA style chevy. 10x better braking then you will have ever had.