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I managed to get some info about the ELSD differential used in both axles in Quadra-Drive-II 4x4 system.

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The current ELSD diff aviabile is QD-II is supplied by Eaton Corporation.
http://www.theautochannel.com/news/2004/04/16/189790.html
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Eaton’s EGerodisc™ electronic slip differentials made its commercial debut on the 2005 Jeep® Grand Cherokee, which was named 4x4 of the Year by 4-Wheel & Off-Road magazine.

EGerodisc™ is a hydraulically-operated electronically controlled limited slip differential that is capable of providing variable torque up to full axle lock, helping to maximize traction when needed. The EGerodisc™ can be used as a stand-alone product that provides ultimate traction control, or it can be integrated with ABS or stability control packages to also provide enhanced vehicle dynamics. Be sure to ask your dealer if your vehicle has an Eaton differential.

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From the service manual:

OPERATION

A gerotor pump (1) creates oil flow through the filter (4) whenever left and right wheels spin at different speeds and the solenoid valve is activated. The oil flow is restricted by a Pressure Regulating Valve (PRV) to build oil pressure. Pressurized oil is then fed to a piston (2) chamber. The piston compresses the clutch pack (3) providing additional torque to the lower speed wheel.

When the antilock brakes are activated the differential solenoid is switched off and pressure is bleed off the clutch pack





 

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Nice find Ahmed!!!
 

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