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Old 07-11-2012, 05:33 AM
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WJ jeep questions

Ok to start off i want to throw out a hypothetical to the jeepgarage brainstrust.

I have a 99 WJ GC limited with quadra drive,

It is my understanding that the diffs are controlled electronically and they progressively send torque to the wheel with traction.

My question is that since its controlled electronically could the computer that controls the diffs be "hotwired" (for want of a better term) to lock and unlock the diffs manually? I am imagining a piggyback computer that allows the user to control the level of lock, rather than the computer itself deciding which wheel needs torque.

I understand this is probably not ideal, the computer is there for a reason and its a good system, prematurely "locking" the diffs will probably cause damage.

So again, it was just an idea that i had while driving around, and i am curious as to the logistics of such a mod.

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Old 07-11-2012, 09:00 AM
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Re: WJ jeep questions

Incorrect... The Vari-Lok differentials use hydraulic pressure to lock up, not electronics.


Quadra-Drive (WJ)

Quadra-Drive employed the New Venture Gear NV247 transfer case. This two-speed chain-driven transfer case uses a gerotor, a clutch pack coupled to a hydraulic pump, to transfer torque between the front and rear axles. The transfer case contains three modes, 4-All Time, Neutral, and 4-Lo. In 4-All Time, torque is applied to the rear wheels under normal driving conditions. If the rear axle starts spinning at a higher rate than the front axle, hydraulic pressure builds up in the gerotor and causes the clutch pack to progressively transfer torque to the front axle until both axles return to the same speed. Neutral mode is intended for towing the vehicle. In 4-Lo, the front and rear axles are locked together through a 2.72 reduction gear ratio.
In Quadra-Drive, the NV247 transfer case is mated to front and rear axles containing Jeep's Vari-Lok differentials. Vari-Lok differentials also use a gerotor to transfer torque between the two wheels.
2004 Grand Cherokee Overland - Brilliant Black
Quadra-Drive - Up Country Suspension - Factory Tow Package - RB1 Navigation

Modifications: K&N 57 Series FIPK, SuperChips Flashpaq for Jeep, 3" Exhaust from the Y-pipe, Flowmaster 70 series, Magnaflow high-flow catalytic converter
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