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Unread 06-26-2015, 05:35 PM   #1
OdintheWanderer
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1994 ZJ 
 
Join Date: Mar 2015
Location: Firth, NE
Posts: 6
High Pitched Whining Noise

I've got a 94 Grand Cherokee limited that makes this god awful whining noise. It starts when I start moving in drive, it doesn't make it in reverse, but it's not really all that bad until I get to about 15-20 mph. After I hit that it gets worse and worse until I hit about 65-75 mph. It also dies down for like a minute once I let off the gas coming back but not quite as bad ( about a 7/10 compared to a 9/10 when I'm pressing the gas ). I just replaced the front drive shaft but it was doing this well before I replaced the drive shaft and well before I bought it, I got it from my grandfather for $500 in hopes that it was a fairly easy fix but I haven't been able to figure out what the problem is. I'll probably take it in if you guys don't know what's up with it (as a last resort, cause I'd rather not spend the money).

Any help is much appreciated.
Thanks

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Unread 06-26-2015, 05:41 PM   #2
dharwood
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1998 ZJ 
 
Join Date: Jun 2015
Location: Ringgold, GA
Posts: 43
Could be ring gear/pinion in either the front or rear (assuming 4wd) or diff bearings. Does it change if you take your foot off the gas say at 55? (different sound when foot is on vs off the gas) or does it remain pretty contant?

Dale
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Unread 06-26-2015, 06:01 PM   #3
Bob T
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1995 ZJ 
 
Join Date: Jul 2001
Location: Pigeon Forge Tn
Posts: 127
What about the rear drive shaft? Also did you check the fluid levels in the differentials and transfer case?
Bob T
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Unread 06-26-2015, 06:04 PM   #4
OdintheWanderer
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1994 ZJ 
 
Join Date: Mar 2015
Location: Firth, NE
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Yeah it will get quieter for a short time when I take my foot off the gas but it picks up again before I put my foot back on the gas.
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Unread 06-26-2015, 06:12 PM   #5
OdintheWanderer
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1994 ZJ 
 
Join Date: Mar 2015
Location: Firth, NE
Posts: 6
Quote:
Originally Posted by Bob T View Post
What about the rear drive shaft? Also did you check the fluid levels in the differentials and transfer case?
Bob T
The only reason I replaced the front drive shaft was because it was making a clunking noise when I put it in gear because it was missing some piece, I can't tell you what piece it was but it was definitely missing the piece. I assumed that the rear was fine, probably not a good thing to do when working on a vehicle. And I didn't even think to check the fluids in the the differentials and transfer case. I'll have to do that once I get a little time to mess with it.
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Unread 06-26-2015, 07:12 PM   #6
dharwood
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1998 ZJ 
 
Join Date: Jun 2015
Location: Ringgold, GA
Posts: 43
Post back with the contents of the front and rear diffs as far as fluid and how much metal is on the magnet. If no one has "attempted to resolve this" previously, I am betting on a low/dry diff. Evidence of fluid around the pinion area is another indication.
Sounds a lot like my Cherokee D30 when I bought it. R&P + bearings cured it. Someone had been in it to the point of having the bearing caps on the wrong side and upside down.
Idiots..... (-:

Dale
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Unread 07-11-2015, 04:58 PM   #7
OdintheWanderer
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1994 ZJ 
 
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Location: Firth, NE
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Alright update time: so I finally had the time to check the fluid levels and found that the front was pretty low and the rear was fine. I also decided to check the transfer case as well while I was at it which was good cause that was also low. So after filling the front diff and tcase back up I drove it a couple miles and it seemed to help at first but now I cant tell if there is a difference before or after I added fluid.
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Unread 07-11-2015, 06:11 PM   #8
SchizophrenicMC
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1997 ZJ 
 
Join Date: May 2012
Location: Arlington, Texas
Posts: 3,533
If it makes noise on acceleration, but not on decel, and it gets louder as speed increases, it's probably a bad pinion bearing. Recommend replacing your differential pinion and carrier bearings and seals.
__________________
1997 Grand Cherokee Orvis Edition
1998 Grand Cherokee 5.9 Limited

FUEL ECONOMY IS FOR LOSERS
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Unread 07-13-2015, 12:01 PM   #9
OdintheWanderer
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1994 ZJ 
 
Join Date: Mar 2015
Location: Firth, NE
Posts: 6
Thats what I was told do to after the fluid level check didnt fix it so that's my next project. Ill let you guys know how it turns out when I find the time to work on it.
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