For sale 2004 GMC 2500HD 6.6 diesel ext cab long box. 279k. Engine programed to 500 +HP K&N cold air, 4" exhaust, recent transmission, coolant, and brake fluid change all brakes within the last year, new starter, pitman and idler arm ,brand new Kenwood stereo. I've owned since 2007 very well maintained and is in good shape inside and out. Tonneau cover and fifth wheel hitch included. $18,000 obo