Caterpillar C-15 (475HP) 14.6L engine, Eaton Fuller 13-speed manual transmission, cruise, engine brake, differential lock, fifth wheel slide, heated mirrors, air condition and heat, stereo, air ride driver and passenger seat, dual exhaust stacks, Unibilt 63 inch double bunk sleeper, tandem 6x4 driveline, gvwr: 50,000 LBS, 12,000 LBS front axle, 46,000 LBS rear axle, air ride suspension, aluminum outside/steel inside wheels, 295/75R 22.5 tires, **note: approx. 300K miles on rebuilt engine