Low rumble/vibration turning at low speeds - JeepForum.com
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post #1 of 5 Old 07-11-2019, 10:03 AM Thread Starter
1996maroonzjf
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Recently my ZJ has started to rumble/vibrate when turning slowly. It seems to be most noticeable if the jeep has been sitting overnight or sat for a few hours while I’m at work, and it happens going forward or in reverse, and on gravel or pavement. It seems to operate smoothly once It has driven a couple of miles. This all started after returning from the mountains and hosing off the mud on the underside. I did spray the knuckles / u-joints pretty good from the front / back, then let the jeep sit for about 12 hours before going to work in the morning. Maybe water got into the u-joints and corroded the needle bearings while it sat overnight?

It feels similar to knobby tires rubbing on the unibody, but I have trimmed bumper/fender liners, and flattened the pinch welds. This just started a couple weeks ago and I have had the 32” BFG M/Ts on for several months. I have also visually inspected the front end while the wheels were turned lock to lock several times and there is no contact being made anywhere, and no movement from track bar / bracket or anything else unusual. Everything (except steering linkage) on the front end has around 15,000 miles on it, including ball joints, u joints, control arms, track bar, a new crown steering gear, and the HP30 which was re-geared / rebuilt. The steering linkage has closer to 35-40,000 miles (Crown HD) and has been greased regularly with synthetic grease and shows no unusual movement and feels tight.

Things I have checked / done:

-Visually inspected the front end while the wheels were turned lock to lock several times (Nothing unusual)

-Jacked up the front end and spun the tires while turning them back and forth looking at the u-joints. (Smooth operation / no movement)

-Pried the u joints with a prybar (No movement)

-Re-torqued motor mounts (slightly loose)

-Re-torqued steering box (slightly loose)

-Greased ball joints

-Greased endlinks / front and rear swaybars

-Greased steering linkage

After doing all this last night the vibration was just as bad pulling out of my driveway this morning (if not worse). Even though u-joints visually look fine and have such low miles that is the main suspect in my mind. Any input would be appreciated as I’m worried it could be something more serious / dangerous.


-Tim
(2) '96 4.0s
#1-'10-'18
#2- HP30/Ford 8.8 - 4.56, OME HDs, 5100's, IRO Adj Arms/Track Bars
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post #2 of 5 Old 07-11-2019, 11:11 AM
CJ7-Tim
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Does the behavior come from the front, or the rear, or can't tell ?

Does it have Limited Slip rear differential ?

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post #3 of 5 Old 07-11-2019, 11:37 AM Thread Starter
1996maroonzjf
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Quote:
Originally Posted by CJ7-Tim View Post
Does the behavior come from the front, or the rear, or can't tell ?

Does it have Limited Slip rear differential ?
I feel it through the steering wheel mostly, but can’t pinpoint if it’s from the front / rear.

Yes - there is a TrakLok in the 8.8 that got new clutches 15k miles ago when it was rebuilt / re-geared and swapped into the ZJ. Its running Lucas full synthetic and I added ford motorcraft friction modifier. The behavior only started about 50 miles ago and also happens when on loose gravel.

-Tim
(2) '96 4.0s
#1-'10-'18
#2- HP30/Ford 8.8 - 4.56, OME HDs, 5100's, IRO Adj Arms/Track Bars
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post #4 of 5 Old 07-11-2019, 05:49 PM
jrcromwell
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Which Transfer case are you running? Forgive me if I missed it in the original post. I would remove the front drive line and see if the problem goes away.

I can tell the difference from a rear limited slip shot and say a 249 viscous couple shot.

I would isolate front from rear first then go from there.
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post #5 of 5 Old 07-11-2019, 08:30 PM Thread Starter
1996maroonzjf
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Location: Denver
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Quote:
Originally Posted by jrcromwell View Post
Which Transfer case are you running? Forgive me if I missed it in the original post. I would remove the front drive line and see if the problem goes away.

I can tell the difference from a rear limited slip shot and say a 249 viscous couple shot.

I would isolate front from rear first then go from there.
242. I will be pulling the front shaft ASAP.

-Tim
(2) '96 4.0s
#1-'10-'18
#2- HP30/Ford 8.8 - 4.56, OME HDs, 5100's, IRO Adj Arms/Track Bars
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