Mysterious bump in 4Hi - JeepForum.com

 
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post #1 of 8 Old 07-22-2012, 11:47 AM Thread Starter
ShotLine
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Mysterious bump in 4Hi

Hey guys,

So when I'm driving in 4Hi I occasianally get this strange bump that jolts the whole Jeep. Its not rly hard, but it definitely feels like something is wrong. If I shift out of 4Hi into 2Hi it will still bump one more time then stop. I havent felt/heard it yet in 4Lo. Its a 1991 2.5L Yj.

thanks for the help!

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post #2 of 8 Old 07-22-2012, 11:51 AM
Jeepsr4me
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Could be supjective but when the front axle collar engages the axle shaft there sometimes is s bump feel.

Put jeep in 2x4 and lock parking brake and get under the jeep and spin the front drive shaft. See if you feel or hear anything unusual.
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post #3 of 8 Old 07-22-2012, 12:01 PM Thread Starter
ShotLine
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Ill try that, but it continues to do it after driving, not only when its engaging. Ill go look right away though!
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post #4 of 8 Old 07-22-2012, 12:03 PM
Mean Max
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Driving in 4HI, on what kind of surface?

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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

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post #5 of 8 Old 07-28-2012, 11:48 PM Thread Starter
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On roads, or anything really.
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post #6 of 8 Old 07-29-2012, 03:19 AM
Mean Max
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Stay out of 4HI on roads. Your NP231 transfer case is a "part-time" case. You're binding up the drivetrain.

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Quote:
Originally Posted by UltimatE View Post
Max has a picture of every Jeep part ever made.
Quote:
Originally Posted by Benderff View Post
No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
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post #7 of 8 Old 07-29-2012, 09:46 AM Thread Starter
ShotLine
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Oh interesting. So if I only use it on rougher roads at lower speeds it should be fine? Is there anything I should do to help repair any damage thats already been done?

Thanks for the help!
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post #8 of 8 Old 07-29-2012, 10:12 AM
bigbossd1030
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Quote:
Originally Posted by ShotLine View Post
Oh interesting. So if I only use it on rougher roads at lower speeds it should be fine? Is there anything I should do to help repair any damage thats already been done?

Thanks for the help!
Part time, you use it on wet roads, dirt roads, mud, snow, ice, etc. Places where it doesn't have full traction. Don't use it on dry or mildly wet concrete or asphalt. I only use mine on the trail or in winter.

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