Driving Impressions

We've driven multiple versions of the GMC Sierra and found all of them to be comfortable. The 5.3-liter V8 provided plenty of power for the extended cab SLE models we drove. And the 6.0-liter V8 was more than enough for the SLT Crew Cab we checked out. All engines need to be revved up (by truck standards) for best grunt. Generally the Sierra models match competitors for smoothness, though by benefit of their five-speed automatics the Ram 4.7 typically runs with GM's 5.3, the Ram 5.7 and Titan 5.6 compete with the GM 6.0, while Tundra's 5.7 and six-speed auto performance can be matched only by the 6.2 and six-speed auto. If you want better fuel economy but want more towing capacity or acceleration than the XFE models provide, adjustments to driving style can easily return the same 5-percent increase in city or towing mileage. In other words, we're not sold on the gearing of the XFE. Of the suspensions, the Z83 is claimed the smoothest ride. The Z85 is slightly stiffer and for those who often tow moderate trailers, a good choice for towing. The Z71 is set up to enhance off-pavement driving yet works very well on the road. In fact, we think the Z71 is the best suspension setup for comfort on the widest range of surfaces. The Z60 configuration is for street performance and includes big 20-inch wheels; we're all over performance but think trucks should be trucks, so the Z60 is not our first choice. The NHT package is designed for Sierra owners who need to tow and carry the heaviest loads. With NHT, the SLT Crew Cab 4x2 is equipped with the VortecMax 6.0-liter V8 engine, and a 3.73:1 rear axle. Ours was fitted with StabiliTrak, side-curtain airbags, a locking rear differential, and a convenience package that includes adjustable pedals, remote vehicle starting system and rear park assist. The SLT with NHT suspension is designed for maximum capacity trailer towing, with a special steering gear, shock absorbers, rear axle and tires. We found the NHT suspension compliant relative to its carrying capacity. Isolation and control are both very good. By virtue of its fairly stiff spring and shock rates, the NHT suspension can be driven aggressively on winding roads with tire squeal the primary indication you're approaching limits. Steering is direct by truck standards and nicely weighted, providing good feedback about how hard everything is working though the assist can fall behind during repeated full-lock maneuvering as when backing a trailer. However, if you drive empty and don't tow, we don't recommend the NHT package just so you can have the 6-liter V8 due to its harsher ride. All new Sierras benefit from much improved brakes over earlier models, whether they have the rear discs or drum brakes. The integrated brake controller that's available should find favor with drivers who tow RV or box trailers. However, be sure your trailer brakes are compatible with it before choosing the option, as some electro-hydraulic disc conversions do not work with the integrated controller. If it is compatible, it's a great feature, eliminating the mess of installing an aftermarket unit and offering more precise braking. The highest tow rating for a Sierra is 10,700 pounds on extended cab (not long bed) or crew cab model; top regular cab rating is 9200 pounds. Note these figures typically apply to a truck with just a driver on board, and vary substantially based on a variety of equipment and options.

Final Word

The GMC Sierra is an excellent choice among full-size pickups. Those who plan to use their trucks for commuting to work, carrying lots of family members and towing boats, may prefer the SUV-style interior, while those who use their trucks primarily as working tools likely will opt for the more utilitarian-oriented pure pickup design. G.R. Whale test drove various Sierra models and filed this report to NewCarTestDrive.com from California; with Larry Edsall reporting from Phoenix.