okay so far changed the oil went with rotella 10-40 regular oil and a mobil 1 filter.....serviced both diffs and transfercase used valvoline 75 90 synthetic gear oil...also changed the power steering fluid used maxlife power steering fluid by valvoline...I used a brake bleeder pump to suck the tank dry filled started truck cycled wheels and repeated three times....I got most of the old fluid out using this method...I did try taking the belt off and turning the pulley by hand with not much success I was hoping that it would cycle out the old fluid into the tank....this weekend I'm dropping the tranny pan have a new filter and gasket on the way.....the transfer case has quieted down with the new fluid.....peace