Section 21 (Mp3023 Transfer Case (Service Information)): Description: Notes

The Select-Trac® II is the MP3023 two-speed, on-demand, active four-wheel drive transfer case that provides optimum traction for a wide range of conditions, while maximizing driver convenience. When operating in 4WD Auto mode, this sophisticated system anticipates and prevents slip by redirecting torque as necessary.

For added traction capability when traversing steep grades, rough terrain or extremely poor traction surfaces, the transfer case includes a 4WD Low mode. This second speed gear multiplies engine torque 2.72 times and locks the clutch pack for maximum traction.

Electric shifting between 4WD AUTO and 4WD Low is effected with a console-mounted switch. A pushpin button is used to shift to Neutral mode.

The MP3023 transfer case provides the following benefits:

• Active, on-demand four-wheel drive requires no driver input.
• Instantly anticipates slip and preemptively redirects torque as needed.
• Vehicle stability under all conditions because torque is constantly being transferred.
• 4WD Low operation mode provides an advantage over vehicles equipped with a single-speed all-wheel drive transfer case.
• Electric shifting between 4WD Auto and 4WD Low provides smooth operation and improved NVH control compared to systems with mechanical linkage.
• Enhanced traction and stability provided by the Traction Control and Electronic Stability Program (ESP) working in tandem with four-wheel-drive.
• A robust design and sealing for reliability.
• Maintenance-free.
• A neutral mode permits flat towing.