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Unread 07-23-2012, 07:10 AM   #1
Zjeeplover
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1995 XJ Cherokee 
 
Join Date: Feb 2007
Location: Crossville, TN
Posts: 239
Not your typical driveline vibe.

I'm getting vibes at almost all speeds. I do have an SYE and am running an Adam's Offroad DC rear shaft. It's not in the diffs, pinion angles, driveshafts are good, and joints are good. Tires, wheel bearings, etc have been ruled out as well. All this has been verified by Essentially Offroad. No trouble with shifting at all. It's a high frequency vibe. I'm thinking it's in the trans or TC. Anyone had a similar problem? Suggestions?

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Unread 07-23-2012, 11:02 AM   #2
sAe23
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1995 XJ Cherokee 
 
Join Date: Apr 2009
Location: Los Angeles / SFV, California
Posts: 2,323
Is this a new, out of the blue, symptom, or did it happen right after installing the SYE?
Have you tried driving w/o the rear (or front) shaft?
Have you MEASURED the angles? What are they?

I was vibration free before installing my SYE. Now I get mirror shattering vibes above 60mph (70, after installing shackle relocation brackets. Have not re-measured angles yet).
Angles are good, tires balanced. No vibes w/o rear shaft. It's been balanced and rebuilt.
Still need to verify runout on pinion and transfer case but there is no visible sign of a problem there...
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Unread 07-23-2012, 11:10 AM   #3
Zjeeplover
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1995 XJ Cherokee 
 
Join Date: Feb 2007
Location: Crossville, TN
Posts: 239
It started after installing a poly trans mount, which has now been replaced with an OEM rubber mount. I installed the SYE and my shackle relocation brackets on the same day. I can't remember the pinion angle but I did measure it with an angle finder and have had two shops tell me my pinion angles are perfect. I've driven w/o the front and rear shaft, separately of course. Still had vibes.
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Unread 07-23-2012, 12:04 PM   #4
larjerr
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1998 XJ Cherokee 
 
Join Date: Sep 2009
Location: wilmington nc
Posts: 41
Does it change immediately after letting off gas or accelerating?
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Unread 07-23-2012, 07:30 PM   #5
Zjeeplover
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1995 XJ Cherokee 
 
Join Date: Feb 2007
Location: Crossville, TN
Posts: 239
No, it's consistent throughout acceleration, deceleration, and coasting.
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Unread 07-24-2012, 02:07 AM   #6
sAe23
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1995 XJ Cherokee 
 
Join Date: Apr 2009
Location: Los Angeles / SFV, California
Posts: 2,323
Well then, either both your shafts need rebuilding, or it's the tires or something else
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Unread 07-24-2012, 06:57 AM   #7
Pats94
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2001 XJ Cherokee 
 
Join Date: Mar 2012
Location: Des Moines, Ia
Posts: 421
If it wasn't vibrating before, I'd really inspect the hell out of those 3 items. Have you looked at that sye for run out and the yoke?
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