Command Trac 4wd LOCK - JeepForum.com

 
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post #1 of 8 Old 12-29-2011, 02:14 PM Thread Starter
kxeddiexp
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Command Trac 4wd LOCK

Ok so i have the 2012 liberty sport command trac II. it has 2wd , 4WD LOCK, and 4 WD Low.

I know 4WD Lock is only to be used on slippery surfaces. Such as heavy rain or snow. If you use 4WD Lock on dry surface and try to make a u-turn or park into a tight space in a parking lot, it will lock up and if you force it, you will experience wheel hop. almost feels like driving with the e-brake on.

here is my question:
it was raining pretty hard yesterday so i switched on the 4wd LOCK and started driving on the highway. it was fine but when i got off the highway to the shopping mall and tried to park the car, it got so stiff the wheels started to hop!

so does this mean i have to turn off the 4WD LOCK when getting off the highway into a local parking lot or to make sharp turns?

that sucks!

anyone?

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post #2 of 8 Old 12-29-2011, 02:24 PM
JeepN4KC
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This topic has been hashed around on other threads. Another KK guy mentioned that rain doesn't necessarily qualify as "slippery surface" with the 4lock on CTII. I think that could be debated. Still, if you are getting binding during a simple parking maneuver put it in 2wd. You don't need 4wd just to park. As far as the highway during rain, I kind of see the point about 4lock not being beneficial cause what you're looking at is the potential for hydroplaning - not slippage.

~Mike~

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post #3 of 8 Old 12-29-2011, 02:36 PM
tjkj2002
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Wet pavement is still a high traction surface,do not use 4wd lock(part time) on wet pavement.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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post #4 of 8 Old 12-29-2011, 04:28 PM
Jeepin11
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Only use 4 wheel drive on surfaces that have the ability to move under the tire. Such as snow, dirt, gravel, etc. Failure to do so will result in premature drive train wear and could lead to catastrophic failure. Because the front and rear drive shafts are locked together during 4x4 mode the wheels will rotate at the same rpm. The front wheels need to be able to rotate at different speeds to facilitate turning. The only way possible for this is with slippage between the tire and ground. If the wheel cannot slip it causes binding in the drive train. Merely wet pavement will provide extremely little to no slippage at all. Not good.

2011 KK- 265/75-16 Wrangler Authorities on 16x8 Racelin Assault wheels
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post #5 of 8 Old 12-29-2011, 05:12 PM
tjkj2002
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Quote:
Originally Posted by Jeepin11 View Post
Only use 4 wheel drive on surfaces that have the ability to move under the tire. Such as snow, dirt, gravel, etc. Failure to do so will result in premature drive train wear and could lead to catastrophic failure. Because the front and rear drive shafts are locked together during 4x4 mode the wheels will rotate at the same rpm. The front wheels need to be able to rotate at different speeds to facilitate turning. The only way possible for this is with slippage between the tire and ground. If the wheel cannot slip it causes binding in the drive train. Merely wet pavement will provide extremely little to no slippage at all. Not good.
You kinda got the idea but the t-case locks the front and rear driveshafts together.Lockers are the only thing that locks both wheels on each axle together an dthe KK has no OEM locker option.The reason for no 4wd lock(part time) on a traction surface is that you have 2 different axles.The front is the D30M and the rear is the 8.25.Since the diffs are different you can not get the same gear ratio front and rear.They are close but not the same as you must have the same diff front and rear to have the same gear ratio like the Rubicon Wranglers with D44's front and rear.The front axle will always be geared higher then the rear on a mismatched diff setup(front tires spin faster) so even if driving in a straight line you will get driveline bind.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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post #6 of 8 Old 12-29-2011, 05:53 PM
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Quote:
Originally Posted by tjkj2002 View Post
You kinda got the idea but the t-case locks the front and rear driveshafts together.Lockers are the only thing that locks both wheels on each axle together an dthe KK has no OEM locker option.The reason for no 4wd lock(part time) on a traction surface is that you have 2 different axles.The front is the D30M and the rear is the 8.25.Since the diffs are different you can not get the same gear ratio front and rear.They are close but not the same as you must have the same diff front and rear to have the same gear ratio like the Rubicon Wranglers with D44's front and rear.The front axle will always be geared higher then the rear on a mismatched diff setup(front tires spin faster) so even if driving in a straight line you will get driveline bind.
Good stuff tj - I always learn something new on this forum.

~Mike~

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post #7 of 8 Old 12-29-2011, 06:29 PM
tjkj2002
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Quote:
Originally Posted by JeepN4KC View Post
Good stuff tj - I always learn something new on this forum.
Just some examples that I know of.......

For my KJ,sorry not 100% sure for KK's.

D30A/8.25 4.10's is actuall 4.09 gear ratio for the D30A,4.10 gear ratio for the 8.25.

HP44 front/RJ60 rear is 5.13 gear ratio front,5.14 gear ratio for the rear.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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post #8 of 8 Old 12-29-2011, 08:30 PM
Skipper6413
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Wow! Learned something about my Jeep today! Thanks for the tidbit!
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