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I have a 2006 Chevy trailblazer I am getting a loud knocking noise in the rear end sounds like it may come from the driver side. Sound doesnt happen all the time.

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  • Expert
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Find the cause a.s.a.p. in case something worse is going to happen soon! If you have a sway bar check the connecting links on both ends. When the little ball joint end comes apart the free arm can clang on anything close. Check the shocks for loss of oil and loss of dampening when rear end is bounced up and down. could even be broken, as well as a broken spring. Make sure brake parts are attached securely. Jack up back axle and check drive line by rotating wheels back and forth, check for play at wheel (bearings) and universal joints for any play when changing directions. If the emergency brake is inside the rear hub and the backing plate is rusted the brake shoe could have come loose and is being rolled up like a recycled metal marble.

Posted on Apr 07, 2015

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  • Cars & Trucks Master
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Hi Brigit
Someone needs to look underneath.
Take it in to a tyre shop and ask someone to check the rear tyres.
Even if it isn't the tyre they will probably spot what the problem is.
And being a tyre shop might be cheaper than a full mechanics workshop,

Posted on Apr 07, 2015

  • Brigit Cappelletty
    Brigit Cappelletty Apr 07, 2015

    Thanks I took it to a shop this morning. Took to a different shop for the last 2 weeks and they replaced the away bars and drive shaft and its still doing it ...so took it somewhere else

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6ya6ya
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Posted on Jan 02, 2017

countrysi248
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SOURCE: 1994 Chevy Astro has two distinct noises. AT 40

Hey First thing I always look for is cheapest thing to repair or look at .. Make sure your tires are not cupping .. or make sure they are wearing good and smoothe all the way around .. this can make a terrible noise if they are cupped or worn improperly.. then I would Jack up one side and shake the rear wheels make sure those bearings are tight feeling .. you should be able to tell if they are loose this way ... I dont know how many miles are on your van but usually the drive line is not the problem.. this is probably last thing you need need to shake and see if there is play in it.. Holler if you need more and thanks Jerry

Posted on Apr 22, 2009

GARYca
  • 672 Answers

SOURCE: CRV has knocking sound coming from rear passenger side

inspect the braking system for warped or uneven rotor surface, as this may cause this noise and uneven pad wear. CV joints also could cause this if the boots are torn, have insufficient grease, are damaged,or have worn bearings. Hopefully this helps

Posted on Jul 22, 2009

blueextc3221
  • 15935 Answers

SOURCE: 2002 trailblazer making loud humming noise when driving

When you turn right - you're taking weight off the right wheel.
If the noise dissipates - the passenger side wheel bearing is most likely to blame.

Thanks

Posted on Jan 06, 2010

Testimonial: "thanks, wish we would have known that before my husband spent 3 hours on it yesterday..it does make sense tho..thank you VERY much for your help"

  • 819 Answers

SOURCE: 1999 chevy silverado z71 5.3 ujoints just got

i would suspect bad driveshaft hanger bearing - to confirm, jack up back end of truck and hold up with jack stands. have someone in the truck to accelerate to the speed where you hear the noise, listen for the noise - a stethescope is very useful for this. good luck!

Posted on May 10, 2010

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