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Old 10-17-2012, 10:09 AM   #1
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Difference between part time and full time

Whenever I put my X into 4L or 4H the "Part Time" light on the dash turns on.

This morning as I held down the odometer button and turned the key I watched all of my dash lights turn on one by one then the gauge's swept I noticed another light that said "Full Time" Can anyone tell me what they mean? I'm kinda new to the Jeep thing.......... Thanks


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Old 10-17-2012, 10:23 AM   #2
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You can search it on here but basically what it means is part time means you can take it out of 4wheel drive. Full time means it is always in 4 wheel drive. universal dash means both are always on there.

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Old 10-17-2012, 10:50 AM   #3
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Originally Posted by Palmers2000tj View Post
Full time means it is always in 4 wheel drive.
Then why would there be a light?

Full time 4wd is a selectable option than can be used on all surfaces, unlike part-time 4wd, which cannot be used on dry, paved surfaces.

Always in 4wd is commonly called all wheel drive.
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Old 10-17-2012, 11:08 AM   #4
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Part time = Girlfriend

Full Time = Wife
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Old 10-17-2012, 11:19 AM   #5
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To be a little more clear:

- The dash cluster is shared with the Cherokee.

- The Cherokee has a Full Time transfer case as an option. The Wrangler does not.

- Eviendently the lamp and cluster wiring is present because it lit when you put the dash in test mode.

- Part Time is the only Wrangler 4x4 option. It can only be used "part of the time" because the center differential is locked and the f/r axles rotate at the same speeds. This will casuse binding and stress on non loose surfaces.

- Full Time can be used "full time" The center differential is allowed to slip and therefore can be used on all surfaces.

- The Cherokee Full Time transfercase can be shifted between FT and PT (I have the same FT drivetrain in my 99 Durango. I can shift between 2wd-FT-PT-4LO)

Note Full Time and AWD are industry terms some times used interchangeably. It does not mead how its done. AWD tends to mean it cannot be shifted to 2wd. The Chrysler FT/AWD system is very simple and does not shift power. It has a fixed f/r split.
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Old 10-17-2012, 11:22 AM   #6
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Full time 4wd or AWD has a differential in the tcase, between the two drive shafts, thus allowing all 4 tires to rotate at different speeds in a turn.

Part time has no differentiation, the driveshafts are locked to spin at the same speed between front and rear, and can bind up if used on high traction surfaces causing potential catastrophic failure
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Old 10-17-2012, 11:23 AM   #7
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All Wranglers come with strictly a part-time 4x4 system, a full-time 4x4 system is only available in the other Jeep models. The Wrangler shared its instrument panel with the now-discontinued XJ Cherokee so it also contained the full-time 4x4 indicator used (only) by the Cherokee. So that full-time 4x4 indicator is not used in the Wrangler, only the Cherokee.

Part-time is the more aggressive form of 4x4 when compared to the street oriented full-time type of 4x4 system. Part-time was designed for strictly offroad use or when the streets are 100% covered in something slippery like snow or ice. Wet roads don't count as being slippery enough, a part-time 4x4 system should not be used on paved streets that are simply wet from rain... streets that are simply wet have too much traction for a part-time 4x4 system.

A part-time 4x4 system mechanically locks the front and rear axles together so they are forced to turn at the same RPMs. Unfortunately, the front tires must be able to rotate faster than the rear tires during a turn and a part-time system wasn't designed to allow that. Offroad, that's not an issue since poor traction offroad surfaces allow the tires to slip & slide so the front tires can rotate faster against the dirt/mud/sand/etc. when they need to. When they can't, like happens on pavement, the steering bucks and jerks as the tires try to slip against a surface that has too much traction to allow that.

A full-time 4x4 system can be used on the street since unlike a part-time 4x4 system, it also includes a differential between the front and rear axles... exactly like is inside the axle between the left and right tires. The full-time 4x4 system's differential allows the front and rear tirs to rotate at different rpms like the left and right side tires are on an axle.

Hope that helps.
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Old 10-17-2012, 11:36 AM   #8
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Ahh ok, that clears it up, the light coming on is what threw me off. So part time the same as when people say they have front and rear lockers? Since all the wheels are "locked" and turning at the same speed?
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Old 10-17-2012, 11:42 AM   #9
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Lockers are a whole different subject and have nothing to do with part vs. full-time 4x4 systems. Lockers lock the left and right wheels together so neither can slip. A part-time 4x4 system, on the other hand, locks the front and rear axles together.

You can install a locker into the rear axle of a 2-wheel drive vehicle so you can see a locker is independent of a 4x4 system and whether one is present or not.

Here's an article I wrote on lockers years ago that might help.

What? Why do I need a locker? I thought I had 4X4!

And if you aren't asleep by the time you have read that, here's another article that is still related.

4x4 & Torque answers
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Old 10-17-2012, 11:47 AM   #10
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Quote:
Originally Posted by Johnnymoto View Post
Part time = Girlfriend

Full Time = Wife
LOL!!!!

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