GM Turns Us Loose With Their Heavy Duty Truck Line
GM handed off keys to its 2015 Silverado/Sierra HD trucks this week for media flogging. As most enthusiasts already know, the 2500/3500 trucks adopt the 2014 GM 1500 styling and interior improvements, which include inlaid doors and a cab-load of available mobile-office features. Offered with the 380 lb-ft 6.0L Vortec V-8, which has a bi-fuel CNG variant, and 765 lb-ft 6.6L Duramax diesel, the Silverado/Sierra can be configured more than 150 ways: cab choice (regular, double, crew), bed (6.5 or 8 feet), axle ratios (3.73 or 4.10), and cab/chassis availability for commercial/fleet buyers.
StabiliTrak traction control is now part of the 2500/3500 package. Also, workability ratings are up: the carryover powertrain components are recalibrated for a maximum 7,374-pound payload, 19,600-pound hitch towing capacity, and 23,200 5th wheel towing. The Duramax/Allison powertrain stands out. Its Diesel Auto Grade Braking feature co-mingles cruise control, Tow/Haul and the exhaust brake (which uses the variable-vane turbocharger to regulate backpressure) to maintain downhill speed while towing without driver intervention. Also, the esteemed Z71 Off-Road package (shown) adds Rancho shocks and a skidplate. Look for more 2015 GM HD details in the June 2014 issue of 4 Wheel & Off-Road Magazine.