Lots of jolting in the front end when turning in 4wd? - JeepForum.com
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post #1 of 23 Old 01-09-2015, 03:09 AM Thread Starter
XJMcPhee
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Lots of jolting in the front end when turning in 4wd?

Hey all,

Kind of an odd way of putting it, but there's a sort of "shuttering" or "bucking" going on when I was playing with my JK earlier. To be specific, I was in 4 HI with the traction control fully disabled because I was, um, drifting in the snow . I kind of hate how 2wd drifting really isnt an option with the hardwired ESP .

So here I was, in an empty, un-plowed parking lot giving it all she's got and as soon as I start to slow down going sideways, the front end sounds like hell. Its almost sounds like metal clapping its hands followed by a jerking feeling.

Is it play in my drivetrain? The gears? Ball joints? Or could it be the steering components? I feel like it may of put some stress on the Jeep and I'm a little worried.

Also, what is it that causes a type of "jolting" effect when turning tight in 4wd? Is this not good?

Sorry for all the questions. Thanks for any input!

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post #2 of 23 Old 01-09-2015, 05:56 AM
SLADE
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U-Joint bind.


Good way to blow your U-joints and beat the ears off of your inner and outer axle shafts.

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post #3 of 23 Old 01-09-2015, 07:27 AM
RockyClymer
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Agree, U joint bind and no it is not so good, esp when the wheels cannot turn independently, it can tear things up.

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post #4 of 23 Old 01-09-2015, 08:56 AM
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Its a four wheel drive - not an all wheel drive. HUGE difference and you were simply doing something VERY brutal - binding the front u-joints as stated above.

The difference is - a four wheel drive the front\rear drive bias is unchangeable - that is the torque is applied equally to front and rear drive shafts. Get into a drift and not only do the fronts try to rotate at different speed than the rear - the front tires want to spin at different speeds than each other in ANY turning event - and more more so than the rear) - the ujoints bind. If there is very little traction its not so much a problem. But snow is able to break down and your grabbing traction on the asphalt under it. Only a lack of traction allows differing rotation speeds of individual tires.

In an all wheel setup (like the old Blazer transfer cases with all hi, all lo, n, 4lo and 4hi or a Subaru) there is a differential effect at the transfer which allows the front and rear drive shafts to rotate at different speeds as well as the differential allowing the left right tires of same axle to spin at different speeds - so theroretically each wheel can spin at the rotation it needs or wants based on differentials - not traction.

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post #5 of 23 Old 01-09-2015, 11:21 AM
Hemimonster425
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Is the jeep your first 4wd?
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post #6 of 23 Old 01-09-2015, 11:53 AM
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Could also be the transfer case making noise too if it's bucking.
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post #7 of 23 Old 01-10-2015, 11:41 AM
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A follow up question to the OPs question: What if you start to hear a similar noise even when driving straight and it happens no matter if you are in 2 or 4wd? Sort of a similar noise to when you put baseball cards in the spokes of your bicycle... Are the U-joints bad? If so, should I go ahead and upgrade the entire axle, or have a shop just replace the U-Joints? Anything else to look out for?

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post #8 of 23 Old 01-11-2015, 10:17 AM
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I had a zj and had a clanking when driving straight it was my passager front u joint. If your hearing it and can crawl underneath check them you can tell which ones bad it will be really loose.
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post #9 of 23 Old 01-18-2015, 04:01 AM Thread Starter
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Thanks for the input everyone. I'll try to be a little more cautious. This isn't my first 4WD, I've had two XJ's and a YJ prior to buying the JK. I've always been able to have fun in 2WD without traction control taking over and pooping on my party. Guess I'll have to just deal with it.
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post #10 of 23 Old 01-18-2015, 08:04 AM
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You can turn traction control off to have fun. I have no trouble spinning a few donuts in parking lots, not sure what else you are wanting though.

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post #11 of 23 Old 01-18-2015, 08:36 AM
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Could be the front ABS kicking in too. Even though you turn the traction control off, it is not totally off. To totally turn it off you have to go into 4Lo or do the steering wheel dance procedure.

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post #12 of 23 Old 01-18-2015, 02:06 PM Thread Starter
XJMcPhee
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Quote:
Originally Posted by JTPhoto View Post
Could be the front ABS kicking in too. Even though you turn the traction control off, it is not totally off. To totally turn it off you have to go into 4Lo or do the steering wheel dance procedure.
Tried it. Apparently it doesn't work on '13 and up JK's.
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post #13 of 23 Old 01-18-2015, 08:20 PM
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The newer jks have esp electronic stability control it is designed not to let you get sideways.
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post #14 of 23 Old 01-19-2015, 05:56 AM
Michel347
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Disconnect one ABS sensor and it will turn all the nannies off, reconnect after you had fun.

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post #15 of 23 Old 01-21-2015, 12:30 AM Thread Starter
XJMcPhee
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Quote:
Originally Posted by Michel347 View Post
Disconnect one ABS sensor and it will turn all the nannies off, reconnect after you had fun.
I'll give that a try
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