I had the diff drop installed by a truck customizer around the corner from where I work. It took them about 4 hours to deal with it. SLR didn't ship the press tool for the small bushing and getting it back together took a while. I don't think they realized what a PIA it is. Better their aggravation than mine.
Caster and camber are adjusted by the same bolts, so it ends up being a trade off to get the alignment. You may need to increase the camber to get the caster in better. Also I had to have the torsion bars cranked up to about 1/4" gap to get the alignment barely within Spencer's specs.
The SLR torsion bars have settled about 2" total since installing. I've had to crank them up a little each month since installing. I measured Tuesday and the gap at the bumpstops is 1.25", so there is no chance that an alignment will work. I have SLR's spring pack and it has settled with the torsion bars. Right now the truck is close the level. The rear of my rock sliders are a 1/4" higher than the front. No noticeable rake. If I crank the torsion bars back up for an alignment truck will be nose high. I sent an email a couple days ago to SLR to ask for suggestions and am waiting for a response. By the way the lift only has been on for 3 months and 4000 miles