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Use of 4 wheel drive ??


 
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cowboy
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Joined: 05 Jan 2008
Location: Sun City, Ca

PostPosted: Mon Jan 14, 2008 6:53 pm    Post subject: Use of 4 wheel drive ?? Reply with quote

I have been told not to use 4 wheel drive on dry pavement and told a new 4x4 owner the same !! however he stated the previous owner stated he could use 4 wheel drive anytime he desired,dry/wet or whatever. I have also been told not to use 4 wheel drive when it was wet as it would be easier to skid ?? would some of you long time 4x4 owners please give us the right info. thanks, cowboy
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Last edited by cowboy on Thu Feb 03, 2011 5:21 pm; edited 1 time in total
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ehirner
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Joined: 01 Jan 2004
Location: Eastern PA

PostPosted: Mon Jan 14, 2008 7:58 pm    Post subject: Reply with quote

You don't want to use 4wd on dry, high traction surfaces like streets, parking lots, etc. Stick to times when you need it...offroad, snow, sleet, ice, mud, etc.
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Drake69
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Joined: 26 Mar 2004
Location: Stormtroopin....

PostPosted: Mon Jan 14, 2008 11:13 pm    Post subject: Reply with quote

Also, in addition to the above info, Jeeps run several different types of transfer cases, so it also depends on what you have. The older Jeeps will have cases like the Command-trac and Selec-trac systems. Command is the 4WD Part-time system, where you have a 2WHi -> 4WHi -> 4WLo selection (which means it should not be run on dry pavement in 4WHi or 4WLo), and Selec is the 2WHi -> fulltime 4WHi -> parttime 4WLo system, where you would only engage 4WLo in extreme conditions (heavy water, ice, snow, etc...), but you can run on roads in either 2WHi or 4WHi.

If you were to drive a Command-trac on dry pavement in 4WHi, the 4WD locks the front and rear driveshafts together, which causes binding when moving forward, in reverse, and in turns, as well as a lovely noise you won't soon forget. (Uneven terrain negates this because the drivetrain needs to be synched to handle the rougher terrain, and so will adjust for it appropriately, giving you traction when you need it. Add lockers, and the torque is applied to the wheels more evenly, allowing you to crawl over more restrictive obstacles with ease.)

Grands typically run the Quadra-Drive systems which are a more advanced Selec-trac system, in which case you can run 4WHi all the time, but anytime you use 4WHi you're expending more gas to do the same thing in 2WHi, so economically it's more of a waste. If you have a 2W option, then you should be using that all the time irregardless, and reserve 4WHi -> 4WLo for trailing and nasty stuff. Less wear-n-tear on the t-case, and better gas mileage overall. Bottom-line, you have the manual, pull it out and read up on what you've got. If you don't have it, you can search by VIN number on some websites to get more detail on what you might have.

Hope this helps.

Check HERE!!! for Jeep model numbers and specific info.
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