8" springs will require you pay some attention to your drive shafts. You might get lucky with the rear, depending on your wheelbase, but prepare yourself to do something up front. Shims at the very least, new cv shaft at the most. Lowering the t-case will help with the rear shaft, but make the front angle even more severe. Not to mention putting more stress on your motor mounts, possibly putting your distributor into the firewall and less ground clearance. To many negatives for me.
When I put the 8" Alcans on my truck, the stock front shaft would physically stretch from the t-case flange to the yoke on the 60, IF I un-screwed the slip collar on the shaft and let it slide out enough to expose the splines, but the stock 3r CV wouldn't allow enough angle to allow the u-joint to sit into the yoke. We were due to have 16+" of the snow the next day and I needed to have a working front shaft just to get out of the driveway. So I busted out the grinder and went to town on the cv trying to get enough angle out of it to make it work. I managed to get it clearanced enough to bolt up, but even just static, sitting on flat ground it was absolutely maxxed out, at it limits. If there was ANY articulation of the front, if the passenger side dropped even a c*nt hair lower than the drivers side, the CV would have exploded. Called up Jesse over at High Angle and it's looking like for me to have a 100% relaible and wheelable front shaft, I'm gonna be lookin at one of the 42* cv's and 1410 joints at the axle. $800+.
Eitherway, unless you want to be one of those posers driving around with no front shaft, or if you want to actually get out and wheel it, plan on spending some money on it.
Snow storm in question-
Besides, I'm always lookin for another excuse to pic whore it up. 
I have an 88 suburban that I am using as a perts truck. I am not sure what transfer case it has but it was rebuilt 18k miles ago. Would it be sufficient?
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