I realize this may not be the place for this topic, but I'm wondering if someone could give me a brief explanation or refer me to a different section/topic where I could learn the difference between the part-time and full-time function and ideal situations for their use. I have the model that has 2Hi, Part-time, 4Hi, and 4Low.

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2005 CRD Sport
Samco hoses, GDE Ecotune, Fumoto drain valve
Winter mods: air box snorkel removed, front grill covered, viscous fan and clutch removed

http://www.jeep.com/en/4x4/#CommandTrack1,CommandTrack2,

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Cherokee 2,5 CRD: sold - Wrangler TJ 2.5: gone - Touareg V10 TDI: new toy

Solo Liberty en Español: Jeepliberty.es

Thanks TonyCRD, however I don't see where that site addresses the part-time vs. 4Hi is explained. Am I missing something?

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2005 CRD Sport
Samco hoses, GDE Ecotune, Fumoto drain valve
Winter mods: air box snorkel removed, front grill covered, viscous fan and clutch removed

See the 4-wheel drive section of the owners manual. If you don't think you have a copy open the glove box and look on the shelf at the top where the manual normally hides. If there is not a copy hidden there you can download a PDF version from Sir Sam's NOOB guide link or from the Jeep web site.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

Actualy it's pretty simple.

You go to the mall on blacktop: use 2wd
It's raining: use 4 full time
It's snowing: use 4 high
There's an earthquake with massive floods: use 4Lo



Al kidding aside:

2WD. Just that...2WD, rear axle only.

Full time: Your transfer case has an open differential. Which means you can use 4 wheel drive all the time, hence 'full time'. Why? because the front axle can rotate at a different speed as the rear or vice versa, so there's no binding. Why is this usefull? You can drive 4x4 on asphalt. It will kill MPG and wear your tires faster though, so use wisely.

4High...what happens when you switch to 4high: you lock up the center diff. So now you do get drive line binding if there is a differrence in rotating speeds between the front and rear axle. And that's bad! So we can only use 4 high on loose surfaces, eg mud, gravel, snow, (anything but paved roads) so tires can 'spin' and equal rotating speeds.

Sounds silly right? Why not use 4 full time all the time? Because when one of your axles starts to spin a tire you're stuck. All power will go to that freewheeling axle. That's why you want 50/50. To keep going.

See this video: http://www.youtube.com/watch?v=RcRBYpccP6g&feature=fvsr

4low...same as 4high except by a set of gears in the transfercase you get a 2.72:1 gear ratio which equals more power to pull you over any obsticals you may encounter.

Hope that clears things up a bit.

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Cherokee 2,5 CRD: sold - Wrangler TJ 2.5: gone - Touareg V10 TDI: new toy

Solo Liberty en Español: Jeepliberty.es

Part time and 4hi are the same thing.Your thinking of the full time selection on your t-case shifter.