2-Speed Torque-On-Demand Transfer Case

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

The 2-speed torque-on-demand system consists of the following components:

Drive Mode Select Module
TCCM (located near the passenger kick panel)
IWE (integrated wheel end) solenoid (located on cowl near brake booster)
(2) IWE vacuum actuators (one on each front hub)
(2) IWE clutch rings (one on each front hub)
4WD mode indicators and messages in the IPC message center
Transfer case with shift motor and high capacity clutch

Vehicles equipped with the 2-speed torque-on-demand system can operate in 2WD (2H), 4WD AUTO (4A), 4WD High (4H), or 4WD low (4L). When shifting into or out of 4WD (4L) range, the TCCM requires that the vehicle speed is less than 5 km/h (3 mph) and the transmission is in NEUTRAL.

The transfer case is equipped with an electronically controlled high capacity clutch which is located inside the transfer case. The clutch provides torque to the front driveline in all 4WD modes.

The transfer case is shifted electronically based on the selected drive mode.

Lincoln Drive Modes allows the operator to select different drive modes. Each mode will select the appropriate transfer case mode for the terrain with no additional input from the operator.