4WD, How does it really work? - JeepForum.com
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post #1 of 2 Old 11-15-2001, 06:22 PM Thread Starter
Brian's 97 ZJ
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1997 ZJ 
Join Date: Jun 2001
Location: SW Michigan
Posts: 372
4WD, How does it really work?

I didn't get an owners manual with my GC, and I'm not sure if I actually know how my 4WD system works.

I have a '97 GC Laredo 4.0L I6 with Selec-Trac. The Selec-Trac lever has position options: 2WD, 4WD (Part Time), 4WD (Full Time), Neutral, and 4WD Low (Part Time).

I obviously? know the 2WD and Neutral. But what is the difference between the Full/Part time 4WD. I'm not understanding how power is transferred between the wheels.

Thanks alot!


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post #2 of 2 Old 11-15-2001, 07:07 PM
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1995 YJ Wrangler 
Join Date: Nov 2000
Location: Santee, CA U.S.A.
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1st all of us Wranglers and most CJs have what's known as part time four wheel drive. That means it's only used part time. In low traction situations. It cannot be used on dry pavement. And that is the case with your 4wd low. When you're actually offroad or in low traction situations you can use 4wd low. If you use it when there's maximum traction, you drivetrain will bind up possibly resulting in a failure of something.

The full-time four wheel drive has slip built into the transfer case, much like your differential. It used to be very similar to a limited slip differential complete with clutch packs. But Jeep has been improving the system and I believe, not positive that you have the same technology that is used in the new "Quadradrive" system. It's kind of a fluid gerator thingamajig. In any case, the technology for the differentials actually came from the advancements in the tcase. That's why I believe you have this in your tcase and not the old style clutches. Obviously I'm not 100 percent certain. But you do have some sort of slip in your tcase. Just the type I'm not certain about.

Matt Osburn

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