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Tranny thump when put in drive??

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Old 07-26-2012 | 10:41 AM
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i<3myxj's Avatar
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Default Tranny thump when put in drive??
What does my tranny hit so hard and make a loud thumping noise when I put it in drive? Please help it doesn't sound good at all and I dont want to keep doing it if I can fix it. Thanks
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Old 07-26-2012 | 11:03 AM
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Check your u joints. Probably the cause
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Old 07-26-2012 | 11:11 AM
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Could be worn motor or trans mounts...



Moved to OEM Tech.
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Old 07-26-2012 | 11:19 AM
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I would say u-joints or mount
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Old 07-26-2012 | 12:37 PM
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How expensive and time consuming of a fix is that?
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Old 07-26-2012 | 12:58 PM
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U joints are about $15.
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Old 07-26-2012 | 01:08 PM
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Can I do it in my driveway?
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Old 07-26-2012 | 01:17 PM
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Yes..there fairley simple 4 bolts
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Old 07-26-2012 | 08:46 PM
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Originally Posted by i<3myxj
Can I do it in my driveway?
Have you ever changed a u-joint?
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Old 07-26-2012 | 08:51 PM
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LOL u-joints can be a PITA or easy peasy. If they are rusted and seized in there its gonna be a major pain. If you want to change u-joints Id rent a balljoint puller and use that to push the u-joint caps out.
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Old 07-26-2012 | 11:06 PM
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My bet is on the transmission mount.
You might want to try this as well...
http://www.jeepforum.com/forum/f11/g...ite-up-357569/
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Old 07-27-2012 | 06:55 AM
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Originally Posted by sam24th
LOL u-joints can be a PITA or easy peasy. If they are rusted and seized in there its gonna be a major pain. If you want to change u-joints Id rent a balljoint puller and use that to push the u-joint caps out.
I've been successful with a hammer and socket, and I live in WI where rust is bad.

If your having trouble use some Blaster.
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Old 07-27-2012 | 07:01 AM
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Transfercase chain also a possible cause ....u joints-mount-chain.
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Old 07-27-2012 | 08:05 AM
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Heck, it could be the exhaust pipe hitting the cross member.

I'm gonna stick my neck out and suggest the OP have someone with a larger automotive skillset take a look at his Jeep for him.
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