Bought a 1999 24v cummins over the weekend for $2000. 161,216 miles Kid locked the Transfer case up and messed up the OD where Transfer case attaches. Bought a Transfer case, and OD for transmission waiting on them to arrive, already had the front and rear driveshafts reworked, as well as new u joints and CV joint. Truck starts just fine, and idles smooth. I notice when I step on the pedal a little it shoots up to 2500 rpm very quick, is this normal? Also what are some recommend upgrades for these trucks?