Engine, 6.6L V8 SIDI, GMPT-V8 8 cylinder V Iron block, four cycle overhead valve water cooled 6.6L SIDI V8 350 hp [261 kW] @ 4500 rpm, 425 lb.-ft of torque [575.8 N-m] @ 3800 rpm. Electronically controlled direct fuel injection. Six bolt main cap design for heavy-duty performance. Engine Control Module (ECM) and Transmission Control Module (TCM) engine control system. Engine cruise control, engine oil cooler, High Idle Mode (1200 rpm).
Exhaust, single outlet
Frame, ladder-type channel frame. Full C section straight frame 33.5" (85.1 cm) wide. Yield strength 44,000 psi, section modulus 7.20 cu.in. and RBM 316,800 lb-ft/in per rail.
Front axle, 6,830 lbs. (3098 kg), reverse Elliot "I"-beam includes integral hydraulic power steering, with an 18.8-20.9:1 gear ratio
Fuel tank, 38.6 Gallon, (146L), rectangular fuel tank mounted between frame rail with electric type fuel pump (mounted in tank). Through the rail fuel fill.
GVWR, 14,500 lbs. (6577 kg) (Standard on 4500 HG model only.)
Incomplete vehicle certification
Lighting, interior dome
Mirror, outside left-hand and right-hand with integral convex mirrors
Rear axle, 4.30 ratio (Standard on 4500 HG model only.)