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Unread 09-06-2012, 07:10 PM   #1
Gcnettl
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1998 ZJ 
 
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Location: Denver, North Carolina
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Driveline vibe

Have a 98 5.9, stock suspension (and worn).. 206k on the clock.

Recently disconnected front driveshaft, new (to me) rims and tires ( when I bought the jeep it had some old snowflakes on it, found some decent tires on stock limited rims on CL and swapped them), new u joints on rear prop shaft (match marked, installed correctly). The jeep handles ok, needs shocks badly, stock ones still there, waiting on blisteins from Kolack, among other things.

So my problem... Very hard to create. Must be going up a slight grade, rpms at 1400, around 40ish mph. Get a vibe that feels a little less harsh than the washboard on the side of the interstate. It also sounds like you are driving over the washboard. Any throttle change and it's gone. I'm stumped.

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Unread 09-06-2012, 08:44 PM   #2
JasonStebbins
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Out of round drive shaft
Bent wheel
Unevenly worn tires
Improperly installed U-joints
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Unread 09-06-2012, 09:11 PM   #3
Gcnettl
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I took my driveshaft back out. U-joints moved freely. Took them back out and inspected. Reassembled. Nothing was wrong there I'm sure of it, I've installed a lot of u joints.

Tomorrow I plan on getting those tires/rims balanced.

Have done nothing to bend a shaft, wasn't doing it before I swapped everything...

I dunno. I doubt the rims are bent, would seem like it would vibrate over 30 regardless if it were that. But just to rule it out I'll go ahead and balance them.

What are the chances it's something in one of my differentials? That's about the only other thing I could guess. Maybe a bearing perhaps?

I do notice, when making turns at low speed, like at a stop sign.. I hear this "rubbing" sound in the rear. Like something rubbing rubber with every revolution of the tire or driveshaft.. Visually inspecting I see nothing under there. And I know the tires aren't rubbing anywhere.

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Edit to say all tires are evenly worn. No abnormal wear either.

Edit again to say I might also jack up the rear, start vehicle and put in drive and observe prop shaft for straightness while spinning.
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Unread 09-07-2012, 10:49 AM   #4
PolkaPower
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Do you have a track lock in the rear? Noise from the rear like chirping or wheel hop could be from the track lock. When my wheel bearings went bad is sounded like a metal grinding sound and got louder as it heated up. You know what bad bearings sound like when they get dirt in them. That crunching sand on metal sound.
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Unread 09-07-2012, 11:11 AM   #5
Kevinyj95
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Whys your front DS dissconnected? Have a bad vc? Im just asking because every once in awhile theres that person removeing parts from there car to try to get better mpg I like to laugh at. What a very odd problem you have indeed.
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Unread 09-07-2012, 11:28 AM   #6
Gcnettl
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Yeah bad vc. Still waiting on parts to repair. Since I got the new tires, I disconnected to keep from wearing them on the front.

I'm not too savy on differentials. Apart from changing the gear oil in them I'm lost.

The noise doesn't sound like a bearing at all. Sounds like something rubbing rubber. Only when I turn though, at low speed, and coming from the rear.

I wonder if a bad trans mount would do it?

It is very hard to re create, the vibe.

The rubbing sound happens every time I turn at low speed, so I'm not even sure they are related.

Edit to ask more about track lock? The differential has nothing attached to it, so if it has a lock it has to be internal to the differential I.e. my Tacoma has an e locker and the locker is located outside of the differential on the housing.

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Unread 09-07-2012, 11:38 AM   #7
PolkaPower
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Quote:
Originally Posted by Gcnettl View Post
Yeah bad vc. Still waiting on parts to repair. Since I got the new tires, I disconnected to keep from wearing them on the front.

I'm not too savy on differentials. Apart from changing the gear oil in them I'm lost.

The noise doesn't sound like a bearing at all. Sounds like something rubbing rubber. Only when I turn though, at low speed, and coming from the rear.

I wonder if a bad trans mount would do it?

It is very hard to re create, the vibe.

The rubbing sound happens every time I turn at low speed, so I'm not even sure they are related.

Edit to ask more about track lock? The differential has nothing attached to it, so if it has a lock it has to be internal to the differential I.e. my Tacoma has an e locker and the locker is located outside of the differential on the housing.

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lol the track lock is inside the diff. I don't know of any locker that's not. The actuator is probably outside but the locker can work unless it's inside the diff to lock the axles together.
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Unread 09-07-2012, 11:41 AM   #8
Gcnettl
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Quote:
Originally Posted by PolkaPower
lol the track lock is inside the diff. I don't know of any locker that's not.


image-2397109785.jpg

This is what I am referring to.

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Unread 09-07-2012, 11:44 AM   #9
ratmonkey
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The trac lok is an lsd. Being a niner, you have one. Chirping tires and rubbing sounds during turns sounds like worn out fluid and clutch plates in it.
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Unread 09-07-2012, 11:45 AM   #10
PolkaPower
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Quote:
Originally Posted by Gcnettl View Post
Attachment 467654

This is what I am referring to.

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That is the actuator not the locker.http://personalpages.tds.net/~thomps...oma/locker.htm

If you open up the diff on the 5.9 and find metal pieces in there it's probably the thrust washers coming apart. Common on worn out LSD's. You know it's rebuild time for sure if you see that.
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Unread 09-07-2012, 11:49 AM   #11
Gcnettl
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So by inferring. I have a trac lock in mine, and it's mechanical, and my Tacoma has an e locker which has an externally mounted actuator?

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Unread 09-07-2012, 11:52 AM   #12
PolkaPower
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Quote:
Originally Posted by Gcnettl View Post
So by inferring. I have a trac lock in mine, and it's mechanical, and my Tacoma has an e locker which has an externally mounted actuator?

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No, the actuator is only the electric motor that activates the locker that is inside the diff.

A track lock is limited slip automatically locking. Not as effective as the e locker but better than nothing in most cases. A lot of cars have lsd's in them. Corvettes have them to keep the rear end from sliding around everywhere in turns ect. My 6 speed Acura TL had one in the front since it was crappy FWD to keep it relatively civilized. I hated that FWD.
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Unread 09-07-2012, 11:52 AM   #13
Gcnettl
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Quote:
Originally Posted by ratmonkey
The trac lok is an lsd. Being a niner, you have one. Chirping tires and rubbing sounds during turns sounds like worn out fluid and clutch plates in it.
Think this could cause the vibration?

I change the oil in it.

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Unread 09-07-2012, 11:56 AM   #14
PolkaPower
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I don't think an oil changing will stop the vibe but it's probably a good idea to open it up anyways and look for metal bits or worn/ chipped teeth.
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Unread 09-07-2012, 12:02 PM   #15
Gcnettl
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Ok. I appreciate the help and I'll put that on the long list of things to do. I feel a rear end overhaul in the future too.

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