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Sounds like you need to do some investigating into the a\c problems, sorry I can't help there. As for the lift I installed a 4in. lift and got along great with blocks in the rear and springs in front, I did have the front driveshaft get pulled out when pulling into a steep driveway once at a weird angle, there is no right or wrong when it comes to replacement driveshafts, some will work fine and some trucks will need new ones, I think it was around $266 to have new ones made out of my old ones, that was balanced out the door and much bigger\stronger then stock.The truck should have K10 badges, these can be bought aftermarket from several places or you can search for some nice used ones, easy fix.For the vent windows it's not that big of a job, nothing a easy day can't fix, just rebuild them once and they will be good for life, you will soooo glad you fixed them!!!Lastly that truck is beautiful!!! Congrats, its a rough life, sometimes you just have to step back and think what makes you happy, my dad always had these trucks growing up and now I find myself buying\collecting clean\nice ones out west and shipping them home, I just hate to see them go to a bad home...