rear end whine
03-19-2007, 04:04 PM
#1
Teching In
Thread Starter
Join Date: Jan 2007
Location: Fighting Illini
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
rear end whine With a stock 3.23 geared 125k mile rear end, is it just natural for the rear end to start to whine? Mine just started the other day and its really bothering me and I want to fix it but am unsure of what exactly is the cause and what needs to be fixed. The pinion seal was leaking for a long time before I got it fixed 2 months ago and im wondering if that had anything to do with it, either the long leaking period or the actual repair itself. Thanks for any help guys.
03-28-2007, 09:20 AM
#2
On The Tree
iTrader: (2)
Join Date: Jul 2005
Location: Groton, CT
Posts: 157
Likes: 0
Received 0 Likes
on
0 Posts
The rear in my Blazer (130k miles on it) just started whining for a similar reason. If it’s whining constantly and at all speeds then you probably have some damage to the gears and/or bearings due to the excessive heat that was generated while you were low on fluid. If that’s the case you can either run it until it eventually breaks, replace it with a junkyard rear, or my personal favorite option……..swap it out for a 9” 
03-28-2007, 12:36 PM
#3
TECH Enthusiast
iTrader: (1)
Join Date: Nov 2004
Location: Ontario, Canada
Posts: 698
Likes: 0
Received 0 Likes
on
0 Posts
If the preload on the pinion has backed off, you will start hearing a progressively worsening whine over time. If the pinion seal was replace the companion flange was taken off completely and put back on. Preload may not have been correctly set.
03-28-2007, 05:47 PM
#4
Teching In
Thread Starter
Join Date: Jan 2007
Location: Fighting Illini
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
Well, would any of the possibilities be causing damage to the LSD? I figure the rear has 125k on it and is in need of some work, so im going to get new gears and bearings in there but DONT want to have to replace the LSD if possible.
Side question...is going from 3.23's to 3.42's going to be noticeable? Either in performance or fuel mileage. Car is simply a daily driver, no track duty, but I wouldn't mind a little performance boost with little to no penalty in MPG.
Side question...is going from 3.23's to 3.42's going to be noticeable? Either in performance or fuel mileage. Car is simply a daily driver, no track duty, but I wouldn't mind a little performance boost with little to no penalty in MPG.
