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I believe the 2wd and 4wd 4dr tahoes have the same rear suspension so it shouldn't matter.
Belltech keys. They came in their kit for the 2dr tahoes but you can buy them seperately. I'm also using Belltech's Street Performace shocks which I like the best out of all that I've tried.
Belltech keys part# 3920
I have the torsion bar unloading tool so it made the job easier. The only problem I had was one of the torsion bars would budge (slide out of the key). Besides that, it was very easy and straight forward. Also I started out by using belltech's short bump stops for the front but decided to put the stock ones back in (trimmed a little bit though). I read that the bump stops on our trucks are part of the suspension, they somehow help with the spring rate of the torsion bars. They have to be kissing the stock bumpstops a little. It rides much better now.
Just look at how the stock stops are on you stock height truck. They are probably touching your lower control arms.
In the front you can use drop torsion keys to get 1"-3" adjustable. For the rear you can use a flip kit (will probably drop it 5"-6"), 3.5" drop leafs (mine dropped me 4.5"), or modify a 4dr tahoe shackle/hanger kit.
I didn't like the load capacity of the belltech drop leafs so I modified a DJM 4dr tahoe shackle hanger kit. It got me 4" drop and I can use my stock leafs. IMO it rides much better now than with the drop leafs.
I used the upper holes of the drop shackle and the barely cleared the fill hose. They have been on for a couple of months now and have had no issues.
First, I unscrewed the stock bolt holding on the driver's side hook in the back cargo area and replaced it with a M10 x 65mm 1.5 pitch bolt. I then used one of these clamps
http://www.fittingsandadapters.com/galsteelvind1.html
and put it around the vent tube next to the filler hose. I tightened it up with a M10 locknut until it lifted the hose up enough to barely clear the shackle.
I can't remember exactly but i believe two new holes were drilled into the frame and one new hole in the hanger (for each side). Then you had to massage the cabin floor a little to clear the hanger. The hardest part about this swap was getting the rivets out, what a pain.
Pics:
Shackles
Drop Hangers
I didn't do anything else to tuck it up there. Its up as far as it will go touching the cab and there is at least 1/4 inch clearance on mine.