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Unread 10-28-2013, 06:02 AM   #1
hdsport
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Normal "Clunk" or not??

2008 JGC Limited, 4.7L V-8, 77,000mi. QTII

Just got my Jeep and have noticed the following:

When I back up and then pull the shifter into "D", there is a "dull clunk" ...(not like there is something loose or out of adjustment, kind of a solid sound).

All other shifting occurs flawless and quiet.
Nothing loose or slipping, very positive.

Something you might expect when changing direction of travel.....BUT I wonder if this is the experience of other owners.

Is there something that I should be looking for......????

Please let me know of your experience.
Thanks,
Paul

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Unread 10-28-2013, 07:00 AM   #2
JeepN4KC
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Quote:
Originally Posted by hdsport View Post
2008 JGC Limited, 4.7L V-8, 77,000mi. QTII

Just got my Jeep and have noticed the following:

When I back up and then pull the shifter into "D", there is a "dull clunk" ...(not like there is something loose or out of adjustment, kind of a solid sound).

All other shifting occurs flawless and quiet.
Nothing loose or slipping, very positive.

Something you might expect when changing direction of travel.....BUT I wonder if this is the experience of other owners.

Is there something that I should be looking for......????

Please let me know of your experience.
Thanks,
Paul
Are you still rolling backwards when you shift into Drive? Also, when you shift into D are you hitting the throttle before the tranny has fully shifted?
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Unread 10-28-2013, 08:29 AM   #3
DarthJeep
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I have this happen periodically. Usually after I've been driving for a while. Then from Park to Anything, I have that "clunk". Like a bad shift or rough shift feel. Interesting to see what it could be?
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Unread 10-28-2013, 12:11 PM   #4
BigRick
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Mine does this as well - every morning backing out of the driveway, then shifting into drive. Once its warmed up, I don't seem to notice it the rest of the day. It does seem to be worst lately, maybe its the colder mornings....
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Unread 10-28-2013, 12:14 PM   #5
kris06
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Front differential bushings thats the clunk
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Unread 10-28-2013, 12:17 PM   #6
R4TCHET
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It could be a bad or going bad front differential bushing. Put it in park then have somebody rock it back and fourth, as it's rocking look at the front diff to see if it's moving and clunking, if it is then it's likely the diff bushing. there is a thread somewhere explaining what you need and how to replace the bushings. I have the same problem

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Unread 10-31-2013, 07:10 AM   #7
hdsport
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Update

I had the Jeep at my Jeep shop for a front wheel bearing replacement and I had the "Pro" check out where the "clunk" was coming from.
So, I hopped in the Jeep and he raised the lift so he could observe.....
With the Jeep running, I ran it through the gears and he found the problem.
We could lift up on the front diff and we saw that there was a large rubber bushing that would go up at least an inch or more.
I assume that this is the "Differential Bushing" that is being referred to.???

So, we will be replacing that next week.

Does anyone have the link to the "How to Repair" this bushing?It doesn't sem to be much of a job....remove the pan and just reach up and replace it?????

Advise, Please.

I'll let you know if this solves the "Clunk" problem when I get it fixed.

Thanks for the replies.
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Unread 10-31-2013, 07:35 AM   #8
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It was in the Tech /DIY stickies ( #9) , but it's not labeled . IMO I would change all three

http://www.jeepforum.com/forum/f67/h...ement-1299567/

Good luck
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Unread 10-31-2013, 04:02 PM   #9
hdsport
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Quote:
Originally Posted by yzjwk View Post
It was in the Tech /DIY stickies ( #9) , but it's not labeled . IMO I would change all three

http://www.jeepforum.com/forum/f67/h...ement-1299567/

Good luck
Thanks, Bushing is ordered...Need only the Diff bushing, the other axel bushing is OK.
Bushing should be in on Monday.
I'll let you know how we make out in the installation.
Probably use the 'air chisel' method to remove the old one.

Looking forward to a quiet shift (no clunk) when done.
Will update next week.

Thanks, again.
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Unread 11-13-2013, 04:45 AM   #10
hdsport
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UPDATE to Repair

Here's my UPDATE:
Bushing arrived from dealer...~$28.00...not bad.

Put Jeep on the lift and looked over the situation.
Not a lot of room to play, but give it a try.
Removed the bolt through the bushing.
Used an air gun with a long extension.
Wrench on the nut holding it secure while air gun removed bolt.
Front diff dropped some, bushing more accessable now.
Used air chisel to try to losen the bushing by curling in the flange but didn't seem to be getting anywhere.

So, marked the front driveshaft and removed the 6 bolts.
Pulled the driveshaft back to try to get more room to play.
Not much of an advantage here.

So, my mechanic had an idea.
Could we rotate the front diff "down" 90 degrees so the bushing was EASILY accessable?
Looked it over and we decided to try to do this.

* Removed the front Diff bushing/bracket.
* Removed the bolt/nut from the axel bushing bracket.
* With the transmission jack under the diff for extra safety, we looked over all of the axel clearences and then placed the jack under the axel for support AND this allowed us to rotate the diff "down" so we had the bushing "right in front of us". (Rotated toward the rear, down, 90 degrees).
Be sure that the axel boot is not rubbing on the frame so it is not ripped.

Used an air chisel and the bushing was out in a minute!!!!!
Used a Press and installed the new bushing...another minute or so.....
Rotated the diff back "up" and put everything back together in reverse.

I haven't seen this procedure written up ANYWHERE in this forum, so I thought it would be a good idea to post this.
It is very simple and allows for a rather difficult job to be done easily.

RESULT:
My "Clunk" is completely gone AND the Jeep is noticably quieter on the road because the normal drivetrain movement is NOT creating any "clunking" from the up & down natural flexing....all is solid now.
I can only imagine that my front diff bearings are much happier now.
This HAD to be a big wear factor on them.
All shifts from R to D and D to R are not even noticable any more...everything is "tight", now. Like new.

I hope this will help others who need to replace the front diff bushing.

IF you use this procedure, PLEASE reply back and let us know how it went and if you have any better modifications to his process.

Again, this procedure really made a knuckel-buster of a job very easy.
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Unread 11-13-2013, 09:45 AM   #11
Clirry
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I will def try your method when part arrives... Yep, my car does clunk.
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Unread 11-13-2013, 11:06 AM   #12
BigRick
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Is this possible or recommended with out a lift? Meaning all I have is a floor jack on the garage floor, or is this definitely a job for someone with a lift.
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Unread 11-13-2013, 01:45 PM   #13
hdsport
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Quote:
Originally Posted by BigRick View Post
Is this possible or recommended with out a lift? Meaning all I have is a floor jack on the garage floor, or is this definitely a job for someone with a lift.
I'm trying to visualize doing this in the garage with the jeep jacked up.

You can lay on the floor and pretty much see what you have to do and if there would be enough room. Just go through the steps in your head and see if you are able to do them. I say yes.

I suspect that if you can get the jeep high enough off of the floor, you could do it. Must be very stable.
Need to be able to bend pretty easy and used to working in this condition.

Overall, I believe it can be done in your garage. Just need to do things in the right sequence.
Two people would be a real advantage.

Let us know how you make out.
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