[Jeep04Special]

Hi I just owned a 01 grand cherokee laredo which had the selec trac in it the 2wd,4 part,4 full, and so on. Well I traded it in on a 04 special edition grand which now has the quadra trac II in it the 4 all time. Just wondering if this new Quadra Trac II is any better then my old selec trac because it seems like the selec trac is better. Just doesnt seem like the Quadra Trac II does anything for me yet which maybe it does and I just need to know how well the Quadra Trac II is. What im trying to say is the Quadra Trac II less of a 4wd system then my Selec Trac or is it going to be better or worse. If anyone here can maybe tell me difference and the qualities of this new Quadra Trac II I have or what thanks again.

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[CanukYJ]

I’ve heard, and if I am wrong then understand this is just what I have heard, that the ‘full time’ 4wd models are ok for snow and what not but they use a central differential. This means that unlike a part time system where one front wheel AND one rear wheel needs to lose traction before you cannot move, the ‘full time no matter what’ systems CENTRAL differential causes all wheels to lose power if 1 wheel is on a slick surface. Again I could be wrong and jeep may be using one with torque biasing which means like the subaru’s it will ‘find’ traction at one wheel but I’m pretty sure it doesn’t and that’s why a lot of people don’t like that style for wheeling, city\street\dirt road driving however it’s fine for. There’s a crude writeup on the differences of these systems at: http://auto.howstuffworks.com/four-wheel-drive.htm
http://auto.howstuffworks.com/differential2.htm This article will show how ‘awd’ or full time 4wd center diffs are setup.
It will show how 4wd in general works AND how 4wd full time works (AWD). It’s a great read if nothing else.

[Jeep04Special]

Originally Posted by CanukYJ

I’ve heard, and if I am wrong then understand this is just what I have heard, that the ‘full time’ 4wd models are ok for snow and what not but they use a central differential. This means that unlike a part time system where one front wheel AND one rear wheel needs to lose traction before you cannot move, the ‘full time no matter what’ systems CENTRAL differential causes all wheels to lose power if 1 wheel is on a slick surface. Again I could be wrong and jeep may be using one with torque biasing which means like the subaru’s it will ‘find’ traction at one wheel but I’m pretty sure it doesn’t and that’s why a lot of people don’t like that style for wheeling, city\street\dirt road driving however it’s fine for. There’s a crude writeup on the differences of these systems at: http://auto.howstuffworks.com/four-wheel-drive.htm
http://auto.howstuffworks.com/differential2.htm This article will show how ‘awd’ or full time 4wd center diffs are setup.
It will show how 4wd in general works AND how 4wd full time works (AWD). It’s a great read if nothing else.

thanks alot for the info appreciate it

ANYONE ELSE HAVE ANY SAYINGS ON THIS QUADRA TRAC II COMPARED TO MY OLD SELEC TRAC????

[coolhand]

When I got my "99 with the full time 4wheel drive I was a little skeptical also. Till the first time I turned of the pavement and onto the rocks without stopping or shifting anything. I was surprised by how well it did. It when up, over and though things so easy I had to keep reminding my self that I was really 4wheling. Granted when I came to some real rough stuff I had to drop into 4 low, which solidly locks the T-case. By the way I'm not 100% sure but I believe the full time 4wheeldrive is "torque sensing".

[CanukYJ]

I was thinking it would lock or sense at the wheels too, I was just listing what I know about some of the general systems hehe. I couldn’t see jeep releasing a 4wd full time that would not do so as it would absolutely blow in any kind of mud\snow. I of course was not 100% on either seeings what DC has been doing to jeeps lately also hehe.

[coolhand]

I just wanted to confirm what I thought so I found this link. Open the link and just click on the tabs to the right.
HTH
http://www.jeep.com/grand_cherokee/4...e=left&mtNav=0