papo020 said:
Rear differential I'll also look at. My only worry with that is I'm at roughly 134k and had bought the truck with 116k. I'm not sure of any of the service that was done before and am not sure what to do when it comes to the rear diff since I don't know the history. Advice?
Trust no one. Assume the prior owner did nothing but put gas in it.
I'd drain and fill the crankcase, transfer case, front differential, rear differential, master cylinder, transmission, and radiator. New air, fuel, engine oil, and transmission filters too. Spark plugs were due at 100k miles as well. New accessory belt, thermostat, and coolant temp sensor too. Clean your throttle body and dump some Techron in the tank while you're at it.
Dex6 for the transmission.
GM Auto-Trak II for the transfer case.
Mobil 1, Valvoline SynPower, or similar quality synthetic 75w-90 for the differentials.
Dex-Cool or Prestone All Makes All Models for the radiator.
Your favorite brand of quality engine oil for the crankcase.
Synthetic DOT3 fluid such as Valvoline for the master cylinder.
100k miles is a pretty major service interval on many cars. That's why many people dump them at that point - they don't want to pay for the maintenance.
ETA - Dang it, roadie beat me by a minute. That's what I get for being so verbose.