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Old 05-19-2012, 07:02 PM   #1
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Transmission noise? Help needed.

Alright folks, here's the problem. When I am simply coasting and not using the accelerator, especially so between 30-50 mph, then I feather or gently pump the accelerator, I can hear a "click" or almost "pop" kind of noise from somewhere up front. It is very brief, but is clearly audible when the gas pedal is tapped shortly and quickly. I watch the tach, and it does not seem to represent a gear change, as the tach stays pretty steady and just slightly moves, as opposed to when you step on it harder and longer and it is shifting gears and the rpms would spike then drop off. Problem happened just occasionally, starting perhaps 2 months ago. Seems to happen more regularly now, and is easily repeatable when I want to do it. I am really sensitive to any odd noises and such now with top/doors off weather finally here.

I am wondering if it is possibly related to the transmission, engine, or perhaps even the exhaust? I am thinking this is likely a job above my experience level and will need to bring it to the dealer (I bought the 8/80 powertrain care service contract when I purchased, and don't plan to pay for this repair). For info, it is a 2008 JKU, AT, 3.73 gears, and a 2.5" lift.

I am trying to arm myself with some knowledge before going to the dealer, and am already preparing my argument for "your lift caused this problem" sort of BS. I am not going to be hearing anything about how 2.5" caused some sort of catastrophic drivetrain geometry changes. Any ideas or insight into what my problem may be would be appreciated so I am not walking in there blind.

Thanks in advance, Jeep brothers and sisters

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Old 05-19-2012, 07:20 PM   #2
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Hard to say but my guess would be a u-joint going bad. I would have to hear it myself to get a better idea.... While your at it check your ball joints. Thats another possibility.

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Old 05-19-2012, 07:39 PM   #3
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Originally Posted by Spro12JK View Post
Hard to say but my guess would be a u-joint going bad. I would have to hear it myself to get a better idea.... While your at it check your ball joints. Thats another possibility.
I could understand how the u joint on the drivshaft may be the offender. Just googled it and it looks pretty easy to do at home and the u joint is pretty inexpensive as well. My plan has a $150 deductible, so this would be cheaper and way faster to do at home. What would be the give away that it is the u joint, if there is such a thing? Or the ball joints, for that matter? How do I go about "checking" them?
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Old 05-19-2012, 07:47 PM   #4
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To check the ball joints, lift the front wheels off the ground and grab the wheel on top and bottom and push and pull top and bottom and if the wheel moves at all then it's the ball joint. As for the u-joint, same thing, raise wheels off the ground and grab drive shaft and knuckle off the front differential and see if there is any play. Also check where the shaft goes into the transfer case.
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Old 05-19-2012, 07:48 PM   #5
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I can probably sketch the Jk's underside with my eyes closed lol
Been through/read it all. Checked everything 17 times looking for the source of my vibes.

What are you doing 2mrw ?

You know how to check ball joints, we did on mine.
As far as the Ujoints. Like said , get the wheels of the ground and move the tires back and then forward. If bad/warn enough, the play can be seen or heard.

How about your TRE's.
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Old 05-19-2012, 08:30 PM   #6
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Alright, I have done the ball joint check before with Ken, so I shook her down and there was nothing, absolutely zero play at the axle with both tires off the ground. Tight as a drum in fact. Crawled under and grabbed the drive shaft and there is play:

My driveshaft - YouTube

I am pretty certain this is where the noise is coming from if this sort of play is visible and audible. Is this normal? When I create the noise, it is not exactly from a "normal" driving scenario, feathering the accelerator is not really typical driving, steady and regular pressure does not create this noise. I think I found the noise sort of accidentally, and now, knowing how to duplicate it, make the Jeep make the noise.
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Old 05-19-2012, 08:55 PM   #7
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Quote:
Originally Posted by gluestick
Alright, I have done the ball joint check before with Ken, so I shook her down and there was nothing, absolutely zero play at the axle with both tires off the ground. Tight as a drum in fact. Crawled under and grabbed the drive shaft and there is play:

My driveshaft - YouTube

I am pretty certain this is where the noise is coming from if this sort of play is visible and audible. Is this normal? When I create the noise, it is not exactly from a "normal" driving scenario, feathering the accelerator is not really typical driving, steady and regular pressure does not create this noise. I think I found the noise sort of accidentally, and now, knowing how to duplicate it, make the Jeep make the noise.
I don't see any play in the joint there.

I know my front DS has a little back and forth also. I think some is OK.

The question is, is it really that loud or is the vid amplifying the sound more?
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Old 05-19-2012, 08:59 PM   #8
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Mine has a little movement too but not that much. U-joint looks to be good. I'm at a loss here right now.
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Old 05-19-2012, 08:59 PM   #9
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I don't have a YouTube account but
I hear the same filmed with my phone.
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Old 05-19-2012, 09:06 PM   #10
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Yeah, u joint looks tight, no play there. Noise was pretty well represented in the video, and would certainly explain the noise I hear while driving. Obviously I was under the Jeep and in a garage, but the noise was not subtle. Play is further up where the DS meets the diff. Raising a few question in my head:

1) Is this a normal amount of play? When I create the noise while driving, it is not exactly from a "normal" driving scenario, feathering the accelerator is not really typical driving, steady and regular pressure does not create this noise. I think I found the noise sort of accidentally, and now, knowing how to duplicate it, make the Jeep make the noise.

2) Is it a problem? As in will it cause my rig to drop the DS while driving at 80 on the highway and put me on the 6:00 news some night and widow my wife and leave my children without a male role model?

3) If it is a problem and is not a normal amount of play, did I create this problem with my lift? 2.5" put on about 6000 miles ago. My gut says no.

4) How do I fix it? I have a $150 deductible on my service contract and would prefer to the work myself if it makes sense monetarily, and am now thinking the dealership would make me eat it if it is driveshaft related and I have a lift. Hoping to not need to drop the $$$ on a front DS.

Without sounding lewd, anyone out there willing to go out to the garage or driveway and grab their driveshaft and give it a wiggle for comparison?
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Old 05-19-2012, 09:12 PM   #11
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Im going to chalk it up as "normal" DL noise that is probably more pronounced with mileage. Top down and you heard it.
"jerking" the gas brings it on all the time.

You need to drive with me in a 6 speed, some days shifting is smooth as silk, other days are a sloppy/clunky mess
I can differentiate the normal noise with something else that is amiss.

Plus if you did have excessive play in the DS, i am assuming it would be felt ?
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Old 05-19-2012, 09:16 PM   #12
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Pm me your email.

I'll send you my video
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Old 05-19-2012, 09:27 PM   #13
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Pm me your email.

I'll send you my video
You're probably going to want my phone number and address next

gluestick77@hotmail.com

Must be a lucky email address, I keep winning foreign lotteries I don't remember entering and very wealthy heiresses from countries I can't pronounce seem to be willing to trust me with their estates.
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Old 05-19-2012, 09:32 PM   #14
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Quote:
Originally Posted by gluestick

You're probably going to want my phone number and address next

gluestick77@hotmail.com

Must be a lucky email address, I keep winning foreign lotteries I don't remember entering and very wealthy heiresses from countries I can't pronounce seem to be willing to trust me with their estates.
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Old 05-19-2012, 09:37 PM   #15
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Video of me shaft on the way
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Old 05-19-2012, 09:45 PM   #16
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Our crickets and shafts sound strangely similar. I think I feel better?
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Old 05-19-2012, 09:48 PM   #17
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Quote:
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Our crickets and shafts sound strangely similar. I think I feel better?
They do...
Or maybe both our jeeps are extremely F'd up
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Old 05-19-2012, 09:50 PM   #18
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They do...
Or maybe both our jeeps are extremely F'd up
I know the clowns that did our work, we could give them a shake down, if need be.
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Old 05-19-2012, 10:32 PM   #19
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It might just be the motor/transmission mounts. I think the TC has rubber mounts, too.

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