- Workhorse engines. Roomy cab.
- No third door for extended cab. Aging design. Low-rent interior trimmings.
With an all-new Sierra just one year away, changes are minimal. Diesel engines make more power and torque, extended cab models get rear heater ducts, a PassLock theft-deterrent system is standard, 1500-Series trucks get reduced rolling resistance tires and three new colors debut. Second-generation airbags are standard.