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Thread: Quadra Trac II problems

  1. #1
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    Icon313 Quadra Trac II problems

    Just purchased 2.7crd Grand Cherokee Very Happy with Diesel engine and 5 speed auto, travelled only 5000 Klms. Quadra Trac II does not hold up to expectations. This vehicle purchased in Australia and only comes with Quadra Trac II.

    The problem is that while doing sand or beach work the Gearotor Coupling in the NV 247 transfer case is to slow to transfer power to all wheels. This allows vehicle rear wheels to bury themselves before the front engages.

    Using low range the vehicle is unstopable as this locks the centre diff, but is restricted to 25mph. So as to change back to 4Hi you then have to slow. The change itself has to be done smooth and slow, if rushed the 5 speed auto when put into drive will not engage. By this time the vehicle has now come to a stop.

    Once moving in 4hi the vehicle is excellent providing you don't have to stop. Otherwise the vehicle soon burys itself even in the easiest of sand conditions. Its as good as a 2wd car.

    Is there a fix for this Gearotor coupling to speed it up, or can the 4lo diff lock be modified to work in 4Hi for take off and once moving disengage back to normal 4Hi.


    Vehicle: Graphite Grey 2.7 Crd Laredo fitted with OME suspension, Cooper A/T 255/70-16, Long Range Fuel Tank, ARB Bull Bar, IPF spots,Counter-Act Electronic Rust Prevention.

  2. #2
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    Default

    thats a good question it would be nice to have the diff locked in 4 all time. Sorry I cant really help maybe the other more knowledgeable folks about mechnicas at the forum can help.

    P.S got any pics of your jeep

  3. #3
    Registered easauto's Avatar
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    Must be an Aussie thing. I posted on this same problem yesterday.
    Hopefully someone may have heard of a mod.
    Lets hope.
    David

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    Don't know of a mod, but the QTII uses the VC instead of a lock-up in 4HI to drive on pavement. You're not going to want a lock-up TC on the road. :pokin: The drive train will bind going around a corner if the tires can't slip on the pavement or even straight if the wheels aren't exactly the same size.

    You'd need a 4HI locked for the sand and 4HI thru the VC for the road (if you road your dub)!
    '98 White 5.9 ZJ, ASD, Towing Package, 3.5" RE Lift, OME Shocks & SS, Skids, 245-75/R16 Pirelli Scorpion A/T's, Hooks & Kevin's Sliderz

  5. #5
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    Default Sorry To Hear That

    I recently drove over 150miles of beach on Padre Island (south Texas) and was very impressed with the QTII and Quadradrive on the WJ. Would occassionally put it into Lo for the deeper sand, but most of the time just left it in Hi.

    I was a not however impressed with the cooling system. Sand driving obviously puts a good load on the engine and the WJ V8 cooling system seems to be marginal (IMHO) when the outside air temps start to exceed about 90-95 degrees.

    Is your 2.7CRD quadradrive or only QTII with open diffs? If no QD, any LSD in rear? Not aware of any way to lock up Hi as you asked. Good luck in finding a solution.
    Y2K 4.7 WJ Limited

  6. #6
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    One possible solution could be to swap in the Selec-Trac NV242 Transfer Case. This is pretty expensive, and you might have to get one shipped from the US, but it gives you the following drive modes: 2WD, 4WD Part Time, 4WD Full Time, Neutral, and 4 Low. In 4WD Part Time, the center differential is locked, and in 4WD full time the center differential is open. Something to consider... check out http://www.wjjeeps.com/tcases.htm for more information. If you do a lot of driving on sand it just might be worth it.

  7. #7
    Registered Stay_lo's Avatar
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    -=- originally posted by 5.9ZJPR -=-
    Don't know of a mod, but the QTII uses the VC instead of a lock-up in 4HI to drive on pavement.
    Not quite true, as the WJ QTII does not have a VC.
    ZJ's with QT however are saddled with that brilliant piece of engineering, designed to last just slightly longer than your warranty. :pokin:
    2000 WJ 4.7 Ltd. with a few mods and a slight rash.

  8. #8
    Registered louc's Avatar
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    The newer (99+) system uses the georotor pump, which applies oil pressure to progessively lock up the coupling, sending the drive to the front. I guess the issue is how much slip does it need at the rear to send power up front, some are satisfied with its snow and off road performance, others have not been. Maybe production tolerances are a factor there as well. That is one thing I like about the selectrac, you know when you have the front engaged, and no slip at the rear needs to happen. Of course it is not an automatically responding system like Quadratrac II, the driver has to know how to use it properly.
    Lou C

    98 ZJ Laredo 4.0 Selectrac
    H-4/ECE Headlights, Painless Wiring Harness, Hella 450 fogs
    Front and rear tow hitches, Air Lift, Bilsteins
    Dynomax Cat Back Exhaust
    B&M Supercooler

    07 WK Limited 5.7 HEMI Quadradrive II


    1988 Four Winns 200 Horizon
    4.3 OMC/Cobra Drive

  9. #9
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    interesting question, I would like 2wd low or open center diff with 4 low for paved surfaces, that low range really helps move a trailer on a steep driveway. It would be great to be able to control the lock on the center diff also.

  10. #10
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    Icon313

    How does the quadra trac II lock up in 4Lo. Maybe this can be moded to lock up in 4Hi. For sand,offroad and slippery conditions only. Even if restrited speed to similar max 4Lo (25mph) then disengage and drive normal 4Hi. Once moving the variable center diff works fine. It is just starting off that is the problem. Again 4lo works fine but is to slow for cruising along sandy conditions. But to change to 4Hi you must come to a near stop to change gear from 4Lo. Here lies the problem. The car strugles to start in 4Hi on sand.

    My vehicle does not have quadra drive, but i think it would not help as for it would still vary torque from front to back diff giving the same problem.

    Thanks for the help maybe somone has a schematic of the nv 247

    Select trac does seem to fix this problem but would be last option.
    Expensive and the car is only 2months old.

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