he didnt ask your opinions, he asked if its possible and how.
it is possible, and i will tell you how.
lowering 2-3" is easy. you need to shorten your coils 2-3". you have a few options. the best choice would be to do some research to find replacement coils that are 2-3" shorter than your current stock coils. if thats not feasable, you can consider cutting loops off your current coils to make them shorter. note that i always advise AGAINST cutting coils as it dramatically reduces your ride quality and can be dangerous if not done properly.
after the shorter coils are installed, you will have to obtain some offset camber eccentric bushings (most auto parts stores and alignment shops carry them) and have the truck aligned. the ride height of most TTB trucks can only be changed roughly 2" from stock height (either up or down) and still be alignable. some trucks can get away with more, some less...so be careful. the TTB itself can safely be lowered over 4" and still function properly (as far as u-joints, axles, clearences, etc are concerned) if you can get it back into alignment.
depending on your final ride height, you might want to shorten your factory bump stops to obtain some extra suspension up travel.
if you want to take it to the extreme, you can cut and turn the beams. this effectivly elliminates your camber problems and you can drop it until something hits (likely the beams on the frame).
theres lots of info on how to lower the back already, so i wont go into that here.
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