Monitors steering column torque 1,000 times/sec to counteract corrugation kickback and reduce driver fatigue.
Automatic transmission downshifting during descents to leverage engine compression and prevent brake glazing.
Mechanical axle synchronization ensuring absolute 50/50 torque distribution across the rear wheels.
4H mechanically locks the front and rear driveshafts. On high-traction surfaces, wheels cannot slip to accommodate different turn radii, leading to "Driveline Bind" and potential gear failure.
It initiates in Tow/Haul mode when sensors detect a decline + brake application. The transmission downshifts to use engine compression for deceleration, preserving brake thermal capacity.
No. 4A (Automatic) uses an electronic clutch pack that only engages when axle speed mismatch (slip) is detected. It is engineered for constant use on variable road conditions.
BTCS is a software solution that applies brakes to a spinning wheel to transfer torque. A physical Rear Diff Lock is superior as it provides 100% mechanical synchronization without heat buildup or torque interruption.
Low Range involves a physical planetary gear reduction shift. Shifting in Neutral removes torque load from the transfer case, allowing the gear-sets to mesh safely.
Most modern systems allow "Shift-on-the-Fly" between 2H, 4A, and 4H at speeds up to 100km/h. 4L engagement always requires a stationary vehicle and a shift to Neutral.