Results 1 to 6 of 6

Noise from rear of the car? Axle pinion bearing maybe?

This is a discussion on Noise from rear of the car? Axle pinion bearing maybe? within the General Help forums, part of the LSx Technical Help Section category; Hello all you helpful folks! I have a strange problem. When I am cruising, holding a constant throttle, I get ...

  1. #1
    Junior Member Jknerr's Avatar
    Join Date
    Mar 2011
    The Fort, Indiana

    02 Trans Am WS6

    Noise from rear of the car? Axle pinion bearing maybe?

    Hello all you helpful folks!

    I have a strange problem. When I am cruising, holding a constant throttle, I get an oscillating noise from what sounds like the rear end. a whrrr ... whrrr. whrrr noise that is related to my speed. Its barely noticeable at 20mph, peaks at around 55~60mph and starts to drown out above that. Its not effected much by turning, and goes away when I accelerate or decelerate. It seems to get a little worse if on an incline, and goes away if going down hill, (I may be backwards on this.)

    Its sounds allot like a bearing. I replaced both wheel bearings, and checked the axles for pitting or damage (no problem there.) I replaced the gear lube with castrol synthetic LSD 75W-90. Noise is still there. Checked, adjusted and eventually removed rear e-brake lines, no fix.

    Car is an automatic with 10 bolt factory rear end. 53,000 miles.

    My best guess is that this is the axle pinion bearing going out, but, even for a 10 bolt it seems awfully early for that. ANY IDEAS ANYBODY!!

    Also, if you know a way to diagnose the pinion bearing that would be helpful.

  2. #2
    Moderator Firebirdjones's Avatar
    Join Date
    May 2006
    You can check the pinion bearing by grabbing ahold of the yoke with both hands and see if you can move the yoke up and down, in or out etc...if it wiggles at all, even the slightest bit, you found your issue. Another tell tale sign is if the pinion seal is seeping oil. Generally when a pinion bearing is on the way out, and the yoke is moving around (even just slightly) the pinion seal can't do it's job and oil starts to seep past.

    Just a couple of scenaro's. Hard to say what your noise could be. Almost sounds to me like you described a typical ring and pinion noise. Some make noise on accel, coast, or float. You described "float" (when there is no strain on the gear accelerating or coasting, and you are just maintaining speed)

  3. #3
    Former Mopar Man 2002ssslp's Avatar
    Join Date
    Jun 2011
    Branchville, NJ

    Silver & Blue
    02 Camaro SS, 04 GTO

    It may also be a tire.
    My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
    My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k

  4. #4
    LS1 or bust b.lee's Avatar
    Join Date
    Aug 2006
    SE, Michigan

    00 Z28 6Spd / 03 Z71 LT

    Ahhh the joys of running a 10-bolt

  5. #5
    Junior Member
    Join Date
    May 2007
    Louisville, Mississippi
    sounds like your ring and pinion gear have some wear in them and only a new set of gears professional install
    will fix it..

  6. #6
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Mansfield, PA

    Black & Blue
    '02 WS.6 / '07 Suburban

    FBJ forgot to mention that most of our cars came from the factory with a weeping pinion seal. However, as he said go ahead and check it for play to see if that is your issue. My Moser 12 bolt is a bit noisy, but I also run a tunnel mount torque arm and that seems to act as an amplifier.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Question: Rear Axle Bearing Replacement
    By Sticks21ta in forum General Help
    Replies: 7
    Last Post: 12-09-2011, 08:20 AM
  2. Rear End Noise , Wheel bearing?
    By gfeller2006 in forum Drivetrain
    Replies: 3
    Last Post: 04-24-2010, 01:42 PM
  3. Rear end pinion seal / bearing
    By Blackout01 in forum Drivetrain
    Replies: 0
    Last Post: 08-08-2007, 11:49 AM
  4. Rear Axle Bearing Surface Issues
    By bigmac776 in forum Drivetrain
    Replies: 5
    Last Post: 10-10-2006, 06:29 PM
  5. Replies: 2
    Last Post: 08-16-2006, 06:17 PM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts