Question about 2000 Jeep Grand Cherokee

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Quadra Trac II 4 wheel drive problem

I have a 2000 Jeep Grand Cherokee 4.7L V8 Limited with Quadra Trac II (permanent 4WD). The Viscous Coupler in the Transfer Case was changed a number of months ago to fix a grinding problem (which worked). However the 4WD system does seem to be working - only the back wheels are driving (or slipping!) and the front wheel should be getting some of the power. I also get a low vibration/grinding noise when turning tightly in parking lots etc It may be that the install of the new viscous coupling was not done properly adn i am now only seeing this. Could it be that there is a lack of oil in the transfer case, or please give me your suggestions. Thanks

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  • hnfunk Apr 21, 2009

    Thanks. A couple of further questions. What specific steps would be done to identify the problem if i was to take it to a repair shop? Does the Viscous coupler have to come out? And how does the oil in the transfer case get topped-up - is there a specific filler hole for this?

  • Richard Scordino May 11, 2010

    I would consider all that you have said as possibilities, but all must be proven by testing and or teardown.

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  • Jeep Master
  • 6,982 Answers

Oil is added to transfer case through a plug usually located about half way up the back of the case.
When making a diagnosis, a good tech relies upon previous experience matching that to known symptoms, then upon teardown to verify his ideas. A good working knowledge is essential so the tech can picture in his mind what is happening inside the unit.(i once knew an old tech who could sit in the shop office and make a correct diagnosis as another tech drove a vehicle into the shop) That's rare, but there are good people out there! Your coupler may have to be removed, but that largely depends upon what the shop sees and feels.
Good luck

Posted on Apr 21, 2009

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1 Answer

Why can't my 2006 jeep go into 4 wheel drive?


are you on dirt? or pavement...????????????????????????
we cant answer until you answer what 4wd option you have.
if that makes no sense, then read the operators guide,
it tells you what's there and how to use it.
read that first, then ask questions,?
and if Part time 4wd?, it';s not to be used on dry pavement only ICE.

eg:

4WD: Select-Trac (or older Select-Drive has a slip coupling too, NP129/229) is AWD in that, "the "4Hi" setting the drive shafts were coupled together using a viscous-type coupler " this anti wind up slipper"
Watch out for exception 1: Select-Trac NP228 based jeeps, it does not have a viscous-type limited-slip coupling. It was used briefly in 1986.
Quada-Trac is full time 4WD (not in lock mode) has a real center differential to shift torque between front and rear. This is the best system , not just a slip clutch as above. Then went BACK to the slipper in 1980. (odd huh?) Up to 1998.
Quadra-Trac-II "4-All Time", "N" or neutral, and "4-Lo". In "4-All Time", torque is applied to the rear wheels under normal driving conditions.
If the rear axle starts rotating at a significantly higher rate than the front axle, hydraulic pressure builds up in the gerotor oil pump and causes the clutch pack, to progressively transfer torque to the front axle, until both axles return to the same speed
Quadra-Trac I was introduced in 2004-10, same as above but is automatic with no driver controls ,like above.
The Quadra-Drive system was introduced in 1999 and is based on the Quadra-Trac II system but adds limited slip differentials (the best full time system ,with great traction to all wheels all the time) 1999 to 04.
Quadra-Drive-II has electronic limited slip differentials or ELSDs 2005 up.

Aug 01, 2014 | 2006 Jeep Grand Cherokee

1 Answer

Why wont my jep go into 4 wheel drive when I pull th lever?


which system?
we cant guess what is In YOUR CAR, ever.
you must SAY. or RTM, in the glove box.
and why are you using 4wd on dry pavement, now>?


4WD: Select-Trac (or older Select-Drive has a slip coupling too, NP129/229) is AWD in that, "the "4Hi" setting the drive shafts were coupled together using a viscous-type coupler " this anti wind up slipper"
Watch out for exception 1: Select-Trac NP228 based jeeps, it does not have a viscous-type limited-slip coupling. It was used briefly in 1986.
Quada-Trac is full time 4WD (not in lock mode) has a real center differential to shift torque between front and rear. This is the best system , not just a slip clutch as above. Then went BACK to the slipper in 1980. (odd huh?) Up to 1998.
Quadra-Trac-II "4-All Time", "N" or neutral, and "4-Lo". In "4-All Time", torque is applied to the rear wheels under normal driving conditions.
If the rear axle starts rotating at a significantly higher rate than the front axle, hydraulic pressure builds up in the gerotor oil pump and causes the clutch pack, to progressively transfer torque to the front axle, until both axles return to the same speed
Quadra-Trac I was introduced in 2004-10, same as above but is automatic with no driver controls ,like above.
The Quadra-Drive system was introduced in 1999 and is based on the Quadra-Trac II system but adds limited slip differentials (the best full time system ,with great traction to all wheels all the time) 1999 to 04.
Quadra-Drive-II has electronic limited slip differentials or ELSDs 2005 up.

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1 Answer

97 jeep grand cherokee stuck in 4WD part time


Which transfer case you have 242 (Selec-Trac on the shifter bezel) or 249 (Quadra-Trac on the shifter bezel). If it's a 242, you're looking at probable linkage adjustment which is done underneath the vehicle. If it's a 249, you're possibly looking at viscous coupling (VC) lockup.

Adjust the shift linkage; heres what to did...

11_22_2011_3_11_35_pm.jpg

...the blue arrow indicates where the linkage originally was (the lock nut screw), moved it down the green rectangle is showing the back of front driveshaft near the tcase, just for perspective.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

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1 Answer

I have a 1997 jeep grand cherokee. it has quadra trac. i want to put a selecta trac transfer case is in. is it just a matter or changing transfer cases?


Possibly, but there may be a difference in the spline count on the coupler you'd need to deal with. There is a lot of info on swaps at jeepforums.com that may be helpful to you in that regard.

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1. Are car battery posts different sizes? 2. Does tire wear(uneven)affect 4wd to 2wd transfer?


battery posts are different sizes. The positive one is larger.
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How Does Quadra Drive Work?


Under normal driving conditions, the system operates conventionally, and the majority of available torque is applied to the rear wheels. However, when front-to-rear wheel speed variations exist, the progressive differential transfers torque to the axle with the better traction, thus minimizing wheel spin and maximizing control.
The key to this design is a progressive coupling Progressive Coupling , which is supplied with pressurized oil by a gerotor style pump. The pump rotor and case are driven by the front and rear driveshafts respectively, and deliver pressurized oil flow to the coupling in proportion to their speed difference. The progressive coupling contains a multi-disc clutch pack that is alternately splined to the front and rear driveshafts, and controls torque variation between the front and rear driveshafts as dictated by the pump.
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