Mechanical Shift-On-The-Fly (MSOF) System

Four Wheel Drive (4WD) Systems


Mechanical Shift-On-The-Fly (MSOF) System

The Mechanical Shift-On-The-Fly (MSOF) system consists of the following components:

- Mode Indication Switch (MIS), located on the transfer case
- Transfer Case Control Module (TCCM), located near the passenger kick panel
- Integrated Wheel End (IWE) solenoid, mounted to the cooling fan shroud
- IWEs, located at each front wheel hub
- Transfer case assembly (includes synchronization clutch)
- Transfer case shift lever

Vehicles equipped with a MSOF system allow the operator to choose between 2-Wheel Drive (2WD) and 2 different Four-Wheel Drive (4WD) modes. The transfer case is shifted manually. Under normal driving conditions, the transfer case is in 2H (4X2), but when desired, the operator may shift into 4H (4X4 HIGH) or 4L (4X4 LOW). The operator can shift between 2H and 4H at any speed. To shift into 4L, the vehicle must be stopped or moving less than 5 km/h (3 mph) and the transmission in NEUTRAL.

The transfer case is equipped with a synchronization clutch which is located inside the case. The synchronization clutch is used to synchronize the speed of the front driveline with the rear driveline during 2H to 4H shifts.