Posting this for a friend who just bought an 82 K10 with 6.2/700r4/208. Motor has 120k and the truck is stock with 3.08 and 31x10.50. He wants to know what to do first. He wants 6" and 35's. I said change trans fluid and add a big ass cooler. Then add 4.56 gears and 35's and 4" lift. What neither of us knows is what to do with the motor. What do you suggest he do to the motor first? Pump timing?, turbo?, exhaust?, intake? muffler bearings? new spark plugs?... like I said , we don't have a clue!!!