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Jeep Grand Cherokee ZJ 1993 to 1998 Tires General Information and Specs
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Nov 20, 2013 | 03:04 PM

#19696

dukie564

☠ CF Sheriff ☠

Joined: Nov 2009

Posts: 15,197

Likes: 18

From: Aberdeen, MD

Year: 1995

Model: Cherokee

Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts

Quote:

Originally Posted by CleptoLeptic

That does not help ... LOL

What else could cause vibrations ONLY under load if not the angle of the drive line?

pinion bearing
TC output bearing
bad ujoints

the fact that you say it "growls" usually means the pinion bearing is bad. First thing i would do is pop the cover off the diff and check out the gears for wear/damage

Last edited by dukie564; Nov 20, 2013 at 03:10 PM.

Nov 20, 2013 | 03:16 PM

#19697

No4x4Yet

Senior Member

Joined: Jul 2010

Posts: 997

Likes: 1

From: Long Island NY

Year: 2000

Model: Cherokee

Quote:

Originally Posted by JerrytheJeep

Yes. I believe you also need to drill the hole in the spring perch to accept the new pin.

I used an allen head bolt and it fit great in the spring perch, no drilling required.

Quote:

Originally Posted by CleptoLeptic

That does not help ... LOL

What else could cause vibrations ONLY under load if not the angle of the drive line?

Under heavy acceleration? It possible under acceleration youre lifting the pinion too high.

Nov 20, 2013 | 03:18 PM

#19698

dukie564

☠ CF Sheriff ☠

Joined: Nov 2009

Posts: 15,197

Likes: 18

From: Aberdeen, MD

Year: 1995

Model: Cherokee

Engine: 4.0L HO I-6, 703 Injectors, Brown Dog Super Engine Mounts

Quote:

Originally Posted by No4x4Yet

I used an allen head bolt and it fit great in the spring perch, no drilling required.

Socket head cap screw

Nov 20, 2013 | 03:25 PM

#19699

CleptoLeptic

Junior Member

Joined: Feb 2011

Posts: 56

Likes: 0

From: Denver, Co

Year: 2001

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by dukie564

Diff is clean ... if it was a bearing or u-joint would it not vibrate all the time to some extent?

Attached Thumbnails

All Lift & Tire questions go here!!!-rear-diff.jpg

Nov 20, 2013 | 03:30 PM

#19700

McCaffrey

CF Veteran

Joined: Jun 2012

Posts: 1,250

Likes: 3

From: California

Year: 1989

Model: Cherokee

Engine: 4.0L

It's real clean. Was there oil in there?

Nov 20, 2013 | 03:35 PM

#19701

Battle

CF Veteran

Joined: May 2013

Posts: 2,624

Likes: 302

From: Asheville, NC

Year: 1999

Engine: 4.0

It could be driveline/rear diff related. Check these out:

https://www.cherokeeforum.com/f67/vi...r-load-146286/

https://www.cherokeeforum.com/f2/yet...s-65-a-116902/

Or, and don't rule this out, a bad motor and or transmission mount.

Nov 20, 2013 | 03:37 PM

#19702

CleptoLeptic

Junior Member

Joined: Feb 2011

Posts: 56

Likes: 0

From: Denver, Co

Year: 2001

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by McCaffrey

It's real clean. Was there oil in there?

LOL .. yeah there was oil in there. I cleaned it out real well for the pic.

Nov 20, 2013 | 03:43 PM

#19703

my89xj

CF Veteran

Joined: Sep 2011

Posts: 10,447

Likes: 0

From: Frederick, MD

Year: 1989

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by CleptoLeptic

LOL .. yeah there was oil in there. I cleaned it out real well for the pic.

Gears aren't. Chewed up?

Nov 20, 2013 | 03:57 PM

#19704

CleptoLeptic

Junior Member

Joined: Feb 2011

Posts: 56

Likes: 0

From: Denver, Co

Year: 2001

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by my89xj

Gears aren't. Chewed up?

Nope. Looks good to me.

Nov 20, 2013 | 04:35 PM

#19705

chipmaker

CF Veteran

Joined: Feb 2013

Posts: 1,286

Likes: 2

From: Belton S.C.

Year: 1998

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by CleptoLeptic

Nope. Looks good to me.

Have you tried lifting the back tires off the ground and spinning the drive shaft with the cover off? Sometimes the lack of oil in the gears and bearings will amplify the noise of a defective part.

Nov 20, 2013 | 04:39 PM

#19706

tuff99

Seasoned Member

Joined: Nov 2012

Posts: 285

Likes: 0

Model: Cherokee

Quote:

Originally Posted by No4x4Yet

Gears a kinda pricey, i dunno if its worth it to go from 3.55 to 3.73s and 4.11s may be a lil much. I know on my mustang 3.91s are known to whine a bit. Some one with better knowledge of jeep gearing can help out better. What kind of off-roading do you do?

light rock crawling trails hill climbs steep creek beds mud pits

Nov 20, 2013 | 04:46 PM

#19707

54boggers

Newbie

Joined: Nov 2013

Posts: 7

Likes: 0

Model: Cherokee

Quote:

Originally Posted by my89xj

Got a quickie/confirmation.

Doing an s10 bastard pack. Now correct me if I'm wrong.
The s10 pack has a 5/16 center pin

While the xj pack has a 3/8 center pin

Therefore when I purchase new center pins, I need to get 5/16 ones and widen the hole in the xj pack?

The s10 pack should have a 3/8 while the xj has a 5/16, the xj spring or spring's will have to be drilled out to accept the new bigger pin plus the spring perch will need to be enlarged also.

Nov 20, 2013 | 04:48 PM

#19708

my89xj

CF Veteran

Joined: Sep 2011

Posts: 10,447

Likes: 0

From: Frederick, MD

Year: 1989

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by 54boggers

The s10 pack should have a 3/8 while the xj has a 5/16, the xj spring or spring's will have to be drilled out to accept the new bigger pin plus the spring perch will need to be enlarged also.

Cool thanks.

Nov 20, 2013 | 04:56 PM

#19709

McCaffrey

CF Veteran

Joined: Jun 2012

Posts: 1,250

Likes: 3

From: California

Year: 1989

Model: Cherokee

Engine: 4.0L

Speaking of leaf spring pins. What kind of bit is required to drill? I've tried a generic bit and that didn't work.

Nov 20, 2013 | 04:58 PM

#19710

DieselD

CF Veteran

Joined: Apr 2011

Posts: 4,825

Likes: 2

From: Indianapolis

Year: '99 and '91

Model: Cherokee

I thought everyone used masonry bits on the leaf springs. Could be wrong.