Transfer Case

WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

Electronic Shift-On-The-Fly (ESOF) System

The ESOF transfer case system consists of the following components:

MSS, located on the instrument panel

Transfer case assembly (includes shift motor and synchronization clutch)

TCCM

Vacuum operated front locking hubs

The electronic shift transfer case is a 2-piece aluminum design. The unit transfers engine power from the transmission to the front and rear axles. Vehicles equipped with an ESOF system allow the operator to choose between 2WD (2H) and 2 different 4WD modes. The transfer case is shifted electronically based on the MSS position. Under normal driving conditions, the transfer case is in 2WD (2H), but when desired, the operator may shift into 4WD high (4H) or 4WD low (4L). The operator can shift between 2WD (2H) and 4WD high (4H) at any speed. When shifting into or out of 4WD low (4L) range, the TCCM requires that the vehicle speed is less than 5 km/h (3 mph) and the transmission in NEUTRAL.

The transfer case is equipped with a synchronizing clutch which is located inside the case. This clutch is used to synchronize the speed of the front driveline with the rear driveline during 2WD (2H) to 4WD high (4H) shifts. The transfer case is lubricated by a positive displacement fluid pump that channels fluid flow through holes in the rear output shaft.

Manual Shift-On-Stop (MSOS) system

The MSOS 4WD system consists of the following components:

Manual shift lever

Transfer case assembly

Manual front wheel hub locks

The Manual Shift-On-Stop transfer case is a 2-piece aluminum design. The transfer case transfers engine power from the transmission to the front and rear axles. Vehicles equipped with the Manual Shift-On-Stop system allow the operator to choose between 2WD and 2 different 4WD modes. The MSOS 4WD system is engaged or disengaged by rotating the control for both front wheel hub locks from the FREE or LOCK position, then manually engaging or disengaging the transfer case with the floor-mounted shifter.