Suspect pinion bearing(s) - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 09-26-2010, 04:59 PM   #1
Join Date: Sep 2010
Posts: 3
Suspect pinion bearing(s)

Recently, I've been hearing a rather conspicuous whine coming from the rear of my 99 wrangler. I hear it at all speeds: whether accelerating, coasting or decelerating. It seems loudest when I take my foot of the gas. I took it to get checked out and was told I had a bad rear differential. They estimated as much as $2k to repair it depending on the number of bad parts etc. That's when I became a mechanic.

So far, I've replaced spider gears, two of which had pitted teeth, but this did not solve the problem. My wheel bearings roll smoothly and my carrier bearings seem okay (to me that is). So today I bought a dial indicator and measured the backlash. I see .017". (is that too much?) I then pulled the carrier and disconnected the drive shaft. I find no play between the differential case and the pinion shaft. However, when I spin the yoke, it doesn't spin as smoothly as I expect it should. I then started the engine and put it in gear (perhaps not advisable but I wanted to see if I heard anything) and engaged the clutch. Then I could really hear some chatter - not loud but enough to really make me suspect the pinion bearings (more than one in there right?).

So does it sound like I'm on the right track?

neophyte is offline   Quote Quick Reply

Quick Reply

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
dana 35 outer pinion seal and bearings 99TJSHORT TJ Tech Forum 11 09-09-2010 09:53 PM
Rebuilt Motor - Spun Bearings seabass2020 TJ General Discussion Forum 2 07-08-2010 12:15 AM
need some help on pinion angle please! waderoe TJ Tech Forum 0 09-21-2009 02:22 PM
Pinion Preload Question rketr General Jeep Discussion 9 06-15-2008 04:32 PM
pinion bearing puller upinar TJ Tech Forum 2 06-10-2007 11:33 PM

» Featured Product

All times are GMT -5. The time now is 03:08 AM.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC