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Loud Knock From Transfer Case when putting it in Drive or Reverse

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Old 04-29-2013, 08:48 PM
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Default Loud Knock From Transfer Case when putting it in Drive or Reverse

A loud knock comes from the transfer case when putting it in drive or reverse any ideas what might be causing this?
Old 04-29-2013, 09:01 PM
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Its probably not the case. Sounds like worn u-joints popping when the load is transfered. Check the drive shaft u joints for wear/ play.
Old 04-29-2013, 09:16 PM
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+1 for checking the joints.
Old 04-30-2013, 06:43 AM
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I was up underneath it having someone put it in drive and reverse so I could see what's up and it's coming from the transfer case.
Old 04-30-2013, 06:03 PM
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Sounds like a loose drive chain. Is it an NP231 or 242? Was it in 4WD or 2WD?

Last edited by seahunt411; 04-30-2013 at 06:28 PM. Reason: identify transfer case
Old 05-01-2013, 10:37 AM
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I'm not sure which one it is it's an 87 cj pioneer with the 4.0. It does it in both 2wd and 4wd. Just when putting it drive and reverse and that's the only time it does it.
Old 05-01-2013, 10:38 AM
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Originally Posted by wolf E Cakes
I'm not sure which one it is it's an 87 cj pioneer with the 4.0. It does it in both 2wd and 4wd. Just when putting it drive and reverse and that's the only time it does it.
It's probably not fully engaging but hey it's a CJ question on an XJ forum... Unless you made a typo
Old 05-01-2013, 11:30 AM
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My 1998 xj with an NP 231 made a similar noise. I dropped the front ds (four 5/16" nuts) and rotated the front yoke back and forth. It was so loose, you could hear the chain slapping around inside.
Old 05-02-2013, 09:24 AM
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Yeah that was a typo I don't know why I was thinking about a cj. Mine is an xj lol. How do you tighten the chain up in a transfer case?
Old 05-02-2013, 09:33 AM
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There is no way to re tension the chain. It has to be replaced. About $120 for the part .
Old 05-02-2013, 11:34 PM
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My '96 classic did the same thing, torque converter was bad
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