Four-Wheel Drive Systems - Overview

Manual Shift-On-Stop (MSOS 

The MSOS system consists of the following:

• Transfer case
• Transfer case shift lever
• Manual locking hubs (hublocks)
• Four-Wheel Drive (4WD) indicators in the IPC message center
• Shift linkage
• Mode Indicator Switch

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

The electronic shift 4WD system consists of the following: 

• Transfer case
• TCCM
• High Speed Controller Area Network (HS-CAN)
• Mode Select Switch (MSS)
• Transfer case shift motor
• 4WD indicators and 4WD system messages in the IPC message center
• Constant Vacuum Hublock (CVH)
• CVH solenoid and vacuum lines
• Vacuum pump (diesel engine only)