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Old 08-28-2012, 09:05 AM   #1
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Test Driving The 4H & 4L ???

If you are test driving a TJ from a dealership, chances are (at least around here) you will not have the chance to put it in the dirt.

Therefore, when you want to check the 4H & 4L, other than just putting it into 4H & 4L and checking that you don't hear any clanging noises or feel it jumping around, how else are you to know if the 4WD gears are working properly?

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Old 08-28-2012, 10:25 AM   #2
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Looking at this website ...

All Wheel Drive Vs. 4 Wheel Drive in Snow | eHow.com

It states " ...When all four wheels are engaged the vehicle should not be driven on dry pavement. It is designed for snow or mud ... ".

So my question is, if you are not supposed to use 4H or 4L on dry pavement, then how are you supposed to test the 4WD capabilities, without being able to get on some dirt?

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Old 08-28-2012, 10:29 AM   #3
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You can use 4x4 to check if it works it is just saying to not use it all the time on pavement
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Old 08-28-2012, 10:36 AM   #4
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Driving it on a high traction surface in 4Hi or 4Lo is not going to hurt it, despite some insisting it will. The Wrangler's 4x4 system wasn't designed for a high traction surface and the Jeep won't steer properly but doing so won't damage it either.
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Old 08-28-2012, 10:38 AM   #5
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On dry pavement in 4WD high or low just keep it in a straight line.
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Old 08-28-2012, 10:45 AM   #6
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Just do it for enough to see if its working and you will be just fine.
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Old 08-28-2012, 11:17 AM   #7
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Quote:
Originally Posted by 20ga View Post
On dry pavement in 4WD high or low just keep it in a straight line.
Driving in even a perfectly straight line won't make a bit of difference. Except on a Rubicon, the front and rear axle ratios are all slightly different so even driving in a straight line will still produce drivetrain wind up. Lastly, there is no need to worry about it since, again, driving in 4x4 on the street won't really hurt anything despite some thinking it will.
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Old 08-28-2012, 11:23 AM   #8
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imo any dealer that will not allow a customer to properly and fully test out all the systems on a used vehicle is not a dealer you want to do business with.

then again, if you have say a 30 day, 1,000 mile warranty on the 4WD system with the dealer paying all costs in the warranty period then I suppose you could always properly test it out once the vehicle is yours.
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Old 08-28-2012, 12:28 PM   #9
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... driving in a straight line will still produce drivetrain wind up...
What is drivetrain wind up?
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Old 08-28-2012, 12:38 PM   #10
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Drivetrain windup is when you're in 4x4 (4Hi or 4Lo) and the front and rear tires rotate at different rpms where the front and rear tires fight to slip against each other to relieve the tension. This happens whenever you're in 4x4 with a Wrangler since its t-case mechanically locks the front and rear axles together so they are spun at the same RPMs.

However, the front and rear tires rotate at different rpms from either making turns left/right since the front tires rotate faster in a turn than the rear tires do, or just driving straight ahead since except on a Rubicon, all Wrangler front and rear axle ratios are .01 different from each other. Like 3.07/3.08, 3.73/3.74, 4.10/4.11 which is due to the front and rear axles having different ring gear diameters.

Drivetrain windup isn't enough of a problem to cause damage though, at least not in most conditions. Afterall, there are many who don't realize they shouldn't be in 4x4 on the street and drive like that all the time without breakage. Same with being in 4x4 in high traction offroad areas like Moab Utah.

Most offroad trails have low traction however which allows the tires to slip to relieve the tension (windup) that builds between the front and rear axles which is why you don't notice eratic steering as much as you do on a high traction surface.
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Old 08-28-2012, 02:02 PM   #11
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Quote:
Originally Posted by Jerry Bransford
Driving it on a high traction surface in 4Hi or 4Lo is not going to hurt it, despite some insisting it will. The Wrangler's 4x4 system wasn't designed for a high traction surface and the Jeep won't steer properly but doing so won't damage it either.
What made you change your mind? Lol.

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