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Question about Quadradrive ??

I have a 2000 Jeep Grand Cherokee, with Quadradrive. (Please note that this is not the same as Quadratec).

I like the Quadradrive, and it does well in mud , ice, and snow. But I do have a performance question.

I built a gravel connecting driveway at our mountain place. At the point where this driveway connects to the main driveway, the grade is about 25 degrees ( this is approximate). At times, I like to **park** on this grade, to get this vehicle off of the main drive, and allow other vehicles to pass on to the front of our house. To **unpark**, I like to backup, so that I am now back on the main driveway.

When I try to back up on this 25 degree grade, my rear wheels will just sit there and spin. The front wheels do nothing. I **cannot** back up at all !!! I have to move forward, go down a 200 foot driveway, turn around, and come UP the drive. The vehicle goes UP ok, because I have forward momentum.

Considering that I have full-time 4 wheel drive, I thought that this Quadradrive system would "sense" when one wheel is slipping, and deliver power to the other wheels (e.g., the front wheels).

I also have an old, 1980 CJ-5. Of course , that old fart will back up on this same spot, and almost anywhere else. It don't have no fancy Quadradrive or any such stuff. It is just 4 wheel drive.

Are we advancing that much in these 4X4 systems ?? Am I missing something here -- a technique or something that I have overlooked ??

Again, I feel that I have super performance in snow, ice, and mud. But there again, that is while I am already MOVING. My current query is why I cannot **backup** on a 25 degree grade, if all 4 wheels have traction-- why do only two of them (the rear 2) spin ???

Thanks for any comments or advice !!

--James--

Reply to
James Nipper
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As far as I know, Quadradrive doesn't have the ability to lock the axles together, which is what you really need in a situation like you describe.

Earle

Reply to
Earle Horton

Try 4-Lo instead of 4-Hi. The 95 and on Quadratracks locked in this mode it's possible the Quadradrive does as well.

Reply to
DougW

According to quadrive advertising, if the rear wheels loose traction, power should be routed to the wheels with the most traction, in this case the front wheels. I can feel the quadrive kick in when I start to spin in gravel, however I have never tried it in reverse. Maybe the quadrive does not work in reverse which does not make sense. Check with your dealer and see what they have to say about it. Let us know what your dealer says.

Yes both axles on the quadrive do lock in 4 lo. I have tried mine.

Reply to
Larry Greenwood

The QuadraDrive should be able to "lock" the front differential, the rear differential and the center differential whenever there is a need. This is in theory... In the real world, I think there are no substitute for real lockers. In my Grand Cherokee, I've experienced that it works as long as there is not TOO MUCH force to be exerted (it can't get a tire airborne)...kind of like a bit more than a very good limited slip differential. In your case, it looks like it's failing to lock the center differential and therefore the front tires are not getting the torque. To actually (mechanically) lock the center differential, put it in 4-Lo and it will work just as your CJ-5.

- Pablo

1981 CJ-7 Laredo 360 V8 2000 WJ Laredo QD V8 2003 TJ Rubicon
Reply to
Pablo Riofrío G.

Probably so. It all depends on what alignment the gears are in when you are parked. This of course is different each time you park, and that is why the user's manual suggests that you be moving to shift to low range. Can you shift into low range before you park?

Earle

Reply to
Earle Horton

This may be a good idea to try-- shifting into low range as I park in this position..

Thanks again !!

--James--

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Probably so. It all depends on what alignment the gears are in when you are parked. This of course is different each time you park, and that is why the user's manual suggests that you be moving to shift to low range. Can you shift into low range before you park?

Earle

Reply to
James Nipper

Yeah that's a problem... you have to be moving at about 4 mph to shift to

4-Lo. Anyway, you should check with the dealer why the center differential is not locking at all.
Reply to
Pablo Riofrío G.

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