I've got a 79 K10 running the stock 350,TH-350,part time NP203 that I'm going to be lifting here pretty soon (within the next 2 months) and I'm trying to decide between a 6" suspension lift or a 4" suspension lift. I'm planning on doing mostly the same type of stuff I did when I had my Jeep. Some moderate wheeling like unmaintained forest roads, some mud bogging, and a lot of desert trails with sand and rocks smaller than about 36" or so. I'm not looking to get too crazy, but I want to have a capable truck. The size of tires I get will be dictated by the height of the lift. 35's with a 6" and 33's with a 4". If I need any "extra" clearance, then I'm thinking about a 1" body lift. On my Jeep, if I went to anything over 3", I was looking at a Slip yoke eliminator kit, longer driveshafts, transfer case drop kit, longer shocks, longer brake lines, and a drop pitman arm. All in all, it would've run about $1000 to perform the necessary "upgrades" to go beyond a 3" suspension lift. I know these older trucks aren't as complicated to lift and can be done for a lot less money, which is one big reason why I bought one in the first place. So, my main questions...... 1) What is needed for a 6" lift vs. a 4" lift? Besides the obvious things like drop steering arm, longer shocks, and longer brake lines. 2) What kind of driveline issues am I linkely going to encounter with each size lift? Are longer/different driveshafts going to be needed? 3) Is there a "preferred" method of reducing driveline angles, be it rotating the axles, shiming the perches, lowering the transfer case? Obviously, I'm new to GM's...so be gentle.