Two-Speed Torque-On-Demand

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

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

Mode Select Switch (MSS)
Transfer Case Control Module (TCCM)
Integrated Wheel End (IWE) solenoid
IWE s
Transfer case shift motor

The Borg-Warner 2-speed torque-on-demand transfer case is a 2-piece magnesium design. The transfer case transfers engine power from the transmission to the front and rear axles. Under normal driving conditions, the unit is in 2 wheel drive high (2H), but when desired, the operator may shift into 4 wheel drive high (4H) or 4 wheel drive low (4L). When shifting into or out of LOW 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 internal electromagnetic clutch and is shifted electronically. This clutch is used to synchronize the front driveline. The unit is lubricated by a positive displacement fluid pump that channels fluid flow through holes in the rear output shaft.