Whining while accelerating, coming from rear. ?? - JeepForum.com
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Unread 01-10-2014, 09:44 AM   #1
Rboomer
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1998 ZJ 
 
Join Date: Sep 2013
Location: Vail, CO
Posts: 8
Whining while accelerating, coming from rear. ??

My 98 limited ZJ whines when I'm accelerating from about 25-55 mph I'm thinking 2nd up to 5th gear. It's loudest is about 45mph and is pretty quiet when I'm doing 70mph. The sound comes from the rear of the car. Not totally sure if it's my fluids, axle, or tranny bearings. Fluids are topped off and haven't done anything else to check what it could be. Would love some input. Thanks

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Unread 01-10-2014, 10:55 AM   #2
JasonStebbins
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1997 ZJ 
 
Join Date: Jan 2009
Posts: 3,139
Four speed transmission. You're mistaking overdrive as the fifth gear.

Whining/moaning is usually a sign of bad pinion/carrier bearings in the differential. When is the last time you changed the gear oils?
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Unread 01-10-2014, 11:51 AM   #3
Rboomer
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1998 ZJ 
 
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It's been a long time for sure since I changed gear oil.
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Unread 01-10-2014, 12:11 PM   #4
JasonStebbins
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Quote:
Originally Posted by Rboomer View Post
It's been a long time for sure since I changed gear oil.
Probably why the bearing failed due to poor lubrication. Once it's bad there's not really much you can do, but changing the fluid can sometimes alleviate it and extend what's left of it's life.

How many miles on it?
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Unread 01-10-2014, 12:20 PM   #5
Rboomer
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157000
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Unread 01-10-2014, 12:50 PM   #6
Oldfrog
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1997 ZJ 
 
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If only when accelerating, it's probably the pinion bearing.
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Unread 01-10-2014, 01:00 PM   #7
riot1987
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I vote on pinion/carrier/axle bearings. ESP if you havent peeked inside your differential for some time
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Unread 01-10-2014, 03:48 PM   #8
Rboomer
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Thanks for the feedback guys!
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