Funny intermittent vibration -
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post #1 of 5 Old 03-17-2017, 02:26 AM Thread Starter
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2001 XJ Cherokee 
Join Date: Sep 2015
Location: Port-Sydney
Posts: 222
Funny intermittent vibration

Here is the back ground:
I have recently done a bastard pack set up using; the bottom 3 springs from a new set of CROWN stock replacement leaf packs and keeping the top 2 OEM leafs from my 01 XJ.
( I chickened out on trying to remove my upper shackle bolts and front leaf spring bolts)
I also added new Monroe max air shocks to assist my aging saggy springs when I load up with fishing gear.
I'm keeping the shocks air pressure down around 35psi so as to not jack up the rear end too much or over stress my crossmember.

I am now experiencing a funny vibration coming from the drive line I suspect when the vehicle is put under load. I can feel it faintly at 40km/h in the floor boards and then it disappears as I hit 50km/ returns with a vengeance at around 80km/h and goes away around 90km/h once my tranny shifts into 4t.
If I let off the vibrations are reduced yet still present, if I accelerate hard the vibrations are much more pronounced than if I accelerate gently or going down hill and allow gravity to assist my acceleration.
I'm not sure if I have a pinion angle that is out of alignment, a bad ujoint, a bad slip yoke, or a failing tranny mount or something else.
Anyone else experience such conditions?
What was the cure?

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post #2 of 5 Old 03-17-2017, 09:16 AM
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Join Date: Mar 2004
Location: long island, ny
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Probably a bad u joint. When you change the angle on old joints that wore into a specific angle, there are usually vibrations when you change that angle.

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post #3 of 5 Old 03-17-2017, 07:50 PM
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1994 XJ Cherokee 
Join Date: Nov 2009
Location: SouthWest Georgia
Posts: 636
Could also be the transmission mount. It allows the rear of the transmission to sag, and the exhaust pipe is bracketed to the rear of the transmission. When the transmission, and the exhaust pipe with it, sags, it allows the exhaust pipe to contact the crossmember.

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post #4 of 5 Old 03-17-2017, 09:38 PM Thread Starter
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2001 XJ Cherokee 
Join Date: Sep 2015
Location: Port-Sydney
Posts: 222
I checked the u joints tonight and they all seemed tight.....but that check led to a grim rear driveshaft slip yoke is sloppy.....that will be a fun replacement
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post #5 of 5 Old 03-18-2017, 07:45 AM Thread Starter
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2001 XJ Cherokee 
Join Date: Sep 2015
Location: Port-Sydney
Posts: 222
So now loosing hope.
I CAN NOT find a NV242. OEM replacement slip yoke or SYE anywhere
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