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Topic Review (Newest First)
10-13-2009 10:52 AM
Timberman Update: It was a bad run of control arm bushings from the manufacturer.. My buddy's are visibly split and his clunk is far more severe than mine.. My buddy and I have the same exact CAs and I will let you guys know if they take care of me.. At last contact; the shop and manufacturer were fussing over who was to pay the labor.. Uh..... NOT F**KING ME!!!

In my opinion; the shop had no idea that these bushings were bad from the manufacturer, so therefore, it is the responsibility for the Manufacturer to deal with their supplier to recoup the labor costs.. This could end up being a huge deal because this is a very well respected lift manufacturer. You can really tell the "True Colors" of a manufacturer in these types of situations.. If it were Warn or ARB, I would have been notified and taken care of before the problem appeared in my rig.. Just my opinion to two GREAT companies there!!
We'll see what happens..
10-11-2009 03:59 PM
Timberman Alright Guys, I have some further info here.

Well, my buddy was down this weekend with his 05 TJ X of which has the same clunk issue i do.. So, He got in his jeep and I watched from the ground and replicated the "Clunk." This happens while releasing the clutch and what I saw was disturbing.. The actual pinion pops-up towards the floor of the jeep and binds the rear "U" joint.. So, we brought my Jeep out of the garage and what would you know; my jeep does the exact same thing. So, the two consistencies here are the fact that we both have the same exact Control arms (RE adjustable uppers and fixed lowers) and the same exact "Clunk." His is quite a bit more severe than mine.. It almost seems as if the axle is being allowed to rotate.. The clunk is contingent upon the amount of torque..

Could this be faulty "U" joints, or is it something to do with the control arms? Pinion Angle?

I have SYE/CV and 4" of lift (same as my buddy's TJ).

Thanks for all info provided.
10-09-2009 04:19 PM
njkeagle
Quote:
Originally Posted by Timberman View Post
It will also clunk when I back out of my garage (slight decline) and hit the brakes..
I had the exact same thing happen to me. I know you said you checked the control arms but did you actually use a wrench to check the bolts? My front control arm did not had play when tested by hand but the bolt was loose. Also check the shock bolts. My rear lower shock bolt was loose and sometimes I heard a very smooth "clank". I would say that if you hear this while pulling out of the garage something is loose. Have you wheeled it lately?

I am in the process using loctite, the front CA are done and I will do the shocks too.
10-09-2009 02:37 PM
somemoore Let us know what the shop says - mine does it too. I have been chalking it up to "normal weird Jeep thing" and not worrying about it, but would like to know if it's something I should take care of.

That's what I love about my Jeep - it makes all kinds of noises that would be unacceptable in any other car, but they are just "normal" and part of the Wrangler experience
10-09-2009 09:53 AM
Timberman
Quote:
Originally Posted by 350chevrolet View Post
bigjohnjeep:

timberman: check the bolts on your control arms, especially the lower ones. mine were tight enough to not be able to move by hand but apparently 60ft/lbs of torque just wasnt enough to keep them still. you can normally see when there moving if you look at them, just looks a little to clean around the bolt, like 1/16" around the bolt, not much but you can see it if you look closely.
Thanks for the response 350.. Actually, I just had a header installed last week and they went through all of the control arms to make sure.. He said the lower fronts were a little loose, but nothing to cause a "Clunk." He greased them as well. The control arms are a recent upgrade.. I basically installed the bottom of of a RE Superflex.. I am exceedingly pleased with the control arms if it means anything to anyone..

Still clunking though..

My buddy has the same issue and he is taking his to a different 4X4 shop this morning, so hopefully we I will have some further info..

Thanks again guys.. I can't believe more people do not have this problem.

Timber

Timber
10-08-2009 10:28 PM
350chevrolet bigjohnjeep: have the tires balanced again, it really does take some shops a few times to get it rite especially when you go to bigger tires. clunk really sounds u-joint related but could also be just normal slop.

timberman: check the bolts on your control arms, especially the lower ones. mine were tight enough to not be able to move by hand but apparently 60ft/lbs of torque just wasnt enough to keep them still. you can normally see when there moving if you look at them, just looks a little to clean around the bolt, like 1/16" around the bolt, not much but you can see it if you look closely.
10-08-2009 06:49 PM
APBAinMaine I had it in the shop twice right after I bought it for the "clunk" and the noise. 117K later, it's still there and still runs great. Get louder speakers.
10-08-2009 06:42 PM
Timberman
Quote:
Originally Posted by ChrisTX View Post
As far as some clunking in the drive train, these can be U-joints, or parts to the CV joint. The little pin part of the CV can wear out. This piece fits into the centering ball. This piece is connected to the main drive shaft, and is a pretty expensive piece to replace. If that part is worn it will wallow out the centering ball. This will cause a knocking/clunking noise on acceleration/deceleration. You probably won't feel any vibrations at all from this. If you replace the centering ball, make sure you check this pin, because if it's worn, it does you absolutely no good to replace the centering ball, because you'll just be buying another one very quickly.
Hello Chris,

I have had my rear drive and transfer case taken apart twice in the last year (don't ask). The mechanic didn't say a word about anything.. He said everything in there looked new.. I have also been underneath my Jeep countless times and nothing in the SYE/CV area appear to be the slightest bit loose..

Is there are way to determine whether the pin is in good shape? Both U joints in the rear have less than 2,000 miles on them..

Thanks for the help sir!

Mike
10-08-2009 02:12 PM
ChrisTX For the vibration, remove the drive shafts one at a time. You can easily hit something that will put a little bend in a drive shaft. The runout should be no more than about .010" I think, which isn't much. It's cheap to get one balanced, so if the vibration goes away when you remove the shaft, I'd suspect the drive shaft. When I bought my Jeep, it was bone stock, and the front shaft had a little warp in it, and it's been bent a few more times since then. I pay about $15 for a balance.

As far as some clunking in the drive train, these can be U-joints, or parts to the CV joint. The little pin part of the CV can wear out. This piece fits into the centering ball. This piece is connected to the main drive shaft, and is a pretty expensive piece to replace. If that part is worn it will wallow out the centering ball. This will cause a knocking/clunking noise on acceleration/deceleration. You probably won't feel any vibrations at all from this. If you replace the centering ball, make sure you check this pin, because if it's worn, it does you absolutely no good to replace the centering ball, because you'll just be buying another one very quickly.
10-08-2009 11:53 AM
Timberman
What amount of "Slop" is considered normal???

Quote:
Originally Posted by Jerry Bransford View Post
Drivetrain "slop" is normal (up to a point) and you can usually feel it between accelerating and letting off on the gas. Most of that is the required backlash (slop) between the ring and pinion gear inside the differential. If you were to get underneath your Jeep with the parking brake set and the shifter in Neutral, you could rotate the driveshaft back & forth to feel the normal slop that is likely causing what you feel.
Jerry,

I have this same "Clunk" or "drive line slop" issue that I can't for the life of me diagnose.. My clunk is only in 1-3 gears when I release the clutch and then when I give it has once in gear (same 1-3) gears. Typically, I can finesse the clutch enough when starting and shifting as to no reproduce the "clunk," but if I have to do it post haste, it will clunk.. It will also clunk when I back out of my garage (slight decline) and hit the brakes..

Does anyone know what in the heck this can be?!?! My buddy has the same exact issue however; his is much much more pronounced than mine.. I have checked everything underneath the Jeep and nothing has play or is loose in any way.. My steering wheel is somewhat crooked.. This all began in July after a pretty extensive wheeling rally..

BIO: 4" suspension lifted 2000 Sport w/ ARB front/Rear, 4.56, sye, CV, the whole nine yards.. I have had the control arms checked and am pretty much at wits-end here guys..

Thanks

Timber
07-23-2008 05:16 PM
bigjohnjeep Thanks for the reply, Jerry. I have been reading on here for a while and I value your opinion. I hope I can get this straightened out soon
07-23-2008 05:04 PM
Jerry Bransford Drivetrain "slop" is normal (up to a point) and you can usually feel it between accelerating and letting off on the gas. Most of that is the required backlash (slop) between the ring and pinion gear inside the differential. If you were to get underneath your Jeep with the parking brake set and the shifter in Neutral, you could rotate the driveshaft back & forth to feel the normal slop that is likely causing what you feel.

So far as the vibration at speed goes, it still sounds like tires to me. It often takes my tire shop two attempts to get my tires balanced well enough so I don't have vibrations at highway speeds myself. Some tire balance jocks only get them balanced "good enough" which for a Jeep, isn't good enough.
07-23-2008 04:48 PM
bigjohnjeep
Drivetrain vibration and "clunky" feeling

Hey guys I think this is my first new thread. I have done a lot of reading on here about the "death wobble" and some of the driveline vibes that are going on with modified rigs. However, my Jeep is not modified at all to my knowledge. I bought this Jeep about a month or so ago. It's a 2001 Sport 4.0L, 5 spd, no lift, standard size tires.

The first thing I need some help with is I'm having a very consistent vibration which starts at around 55mph and gets worse from there. It does not affect the "tracking" of the Jeep; in other words if I let go of the steering wheel it stays straight. This is probably a lame illustration but the feeling is like that of how an orbital sander would feel in your hand and it resonates throughout the Jeep. My rearview mirror is vibrating so that I can see there are vehicles, etc. behind me but the image is dancing. It's very strange and irritating. I recently had my tires (Firestone Indy 500 radials) rotated and balanced but it didn't help. I have looked underneath inspecting the drive shafts and U-joints and nothing looks suspect. I'm at a loss without taking it to a mechanic but then I worry about them experimenting with various things to find the issue.

Next issue: When driving my Jeep I have this feeling of something in the drivetrain being loose when I let off the gas AT ALL and at ANY SPEED. Again, it's something I feel and there is not really a sound associated with it. I feel it a little worse when at highway speed - 55mph. It's really annoying and the best way I know to describe it is - it's as if there is no "cushion" between accelerating and decelerating. It is not a smooth transition. There is a real "clunky" feeling like something abruptly disengaging when I let off the gas pedal.

Could it be that these two issues are related? Has anyone had a similar experience with their rig? This is really sort of a let down because I have "moved up" from a '97 SE 4 cyl. to the 2001 Sport 4.0L and I never had any ride quality issues or any of the rest with the '97 model and it had 197,000 miles on it! By the way, my '01 is knocking on the 100,000 mile mark. I hope someone here can help - Thanks

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