To help the driver remain in control under all driving conditions, Toyota has equipped all 4Runners with a feature known as HAC (Hill Start Assist Control). The HAC system prevents...
the 4Runner from slipping backwards or off to the side when starting to climb a hill from a start. Also standard on all four-wheel-drive 4Runners is the DAC (Downhill Assist Control), which combines the vehicle's brakes with engine braking to avoid unwanted downhill acceleration.
Our four-wheel-drive V6 SR5 included a Torsen limited-slip center differential which transfers the bulk of the engine's torque to the rear wheels. This was evident when driving the 4Runner, as it helped the vehicle remain stable in both off-road and slippery situations. These features complement the 4Runner's standard Vehicle Stability Control (VSC) and traction control.