Just picked up a 2004 C2500 Suburban, 6.0L with the 4L80E. Mileage is higher (230k) but it seems well cared for and was very clean. Currently sorting out some little odds and ends that comes with buying any new used car, but curious what trouble spots I should look for with proactive maintenance? All fluids seem correct and don't look old, although I don't have history on the vehicle. Trans fluid is proper level and nice and red. I'm already planning to tackle the intermediate shaft clunk which I know is a common issue on the 2500 platform. Any other special areas of concern to look for on the drivetrain?

 

very solid vehicle. broken manifold studs, stuck evap vent solenoids, false abs activation from bad wss, tcase oil pump retaining spring breaks and creates a pin hole in the tcase housing
if it was bought privately inspect the steering linkage, suspension and brakes