Join Date: Aug 2016
Location: Fort Wayne, Indiana
The Jeep Active Drive I 4WD uses a fully variable wet clutch housed in the rear drive module. As for the Jeep Active Drive II (available on all three of the aforementioned models), this includes a two-speed PTU with torque management and low range. The system's 4-Low mode locks the front and rear drive shafts for low speed power or towing, while low range provides a 2.92:1 gear reduction for better climbing ability and crawl in off-road conditions. The front and rear driveshafts should have a mechanical connection, not a wet one, IMHO.
The input shaft (drive shaft at the front wheels) and the output shaft to the rear wheels (differential) each carry a series of plates that are alternately intertwined and closely spaced inside the wet clutch housing. All the plates swim in a special fluid (goo) that transfers power from the input to the output plates when needed. If the front-drive wheels begin to slip, their shaft and plates spin more quickly than the others. This speed differential within the housing churns and heats the fluid, which thickens it and more tightly bonds the alternating plates. Some torque is now sent to the grippier wheels until spinning ones regain traction. So, the more the tires slip, the more the clutch plates spin and the hotter the goo (lubricant) gets. If it gets too hot, it disengages until it cools down.
Sad, for a Jeep.
2016 Cherokee Trailhawk: Mango Tango Pearl Coat over Black.
OPTIONS: Every Available Factory Option/Package Except Remote CD Player.
MODS: Whispbars; Mopar Cargo Cover; Mopar Cargo Mat; Mopar/KICKER 9 Speaker Upgrade; KICKER Sub and Amp; Ziebart Undercoating; aFe CAI.
FUTURE MODS: Remote CD Player; Mopar Rock Rails; Rear Fog Lights.
Last edited by dhh3; 03-15-2017 at 12:20 PM.