Rear "clunk" sound upon acceleration - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 11-24-2006, 12:19 AM
joplin05tb joplin05tb is offline
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Rear "clunk" sound upon acceleration

Hi all,

Have noticed a single "clunk" sound coming from the rear of my TB when doing a fast acceleration from either a slow speed or complete stop. Doesn't happen during slow acceleration. Mechanic recently checked the differential fluid levels and are fine. No other noises are present and it otherwise drives like a dream. Searched here for this topic and a few old posts suggest that TBs have intentional excessive driveline play or the driveline may need tightened up. Any thoughts? Appreciate the help.

Steve
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Old 11-24-2006, 02:57 AM
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DEZEL1 DEZEL1 is offline
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Mine does the same too. I agree there are some older posts but no one every came up with a solution.

I am @ 25000 mile but it was doing this at maybe 15000
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Old 11-24-2006, 11:32 AM
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APDMC6008 APDMC6008 is offline
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I changed the differntial fluid and my clunk went away (2002 TB, had about 65K on it at the time), was nasty black gunk. It's fine now.

You could also check your swaybar end links. I had some clunking/rattling up front from that, and I replaced all those and it went away.
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Old 11-24-2006, 07:14 PM
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Take a look at the u-joints, wear in this area will give a clunk. Try shifting from "R" to "D" (stopped of course), a clunk could mean u-joint of ring gear wear.
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Old 11-29-2006, 08:11 PM
02WhiteWs6 02WhiteWs6 is offline
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Quote:
Originally Posted by APDMC6008 View Post
I You could also check your swaybar end links. I had some clunking/rattling up front from that, and I replaced all those and it went away.
I just had my rear swaybar end links replaced under warranty for a clunk/rattle sound comming from the rear. Seems to have fixed it, but seems strange to me. This was at 4,000k
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Old 11-29-2006, 08:39 PM
onewheeldeal onewheeldeal is offline
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Clunk

If you have a locking rear differential it will make a clunk under harder acceleration. From either a stop or slow speed. My clunk became more noticeable around 20,000 miles or so. Changing the fluid will make it smoother and quiter for about another 30,000 miles. I changed mine twice in 92,000 miles. If you have more of a rattling/clunk when going over small bumps its caused by your swaybar end links. There's 2 in the front and 2 in the rear.
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Old 11-30-2006, 04:04 AM
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I too have noticed this. I am at 30,000 miles. I think it might be time to go to the stealer to have it looked at.
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Old 11-30-2006, 11:15 AM
fireman2828 fireman2828 is offline
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My 04 just hit 30,000 miles. When I go over a bump, like maybe a speed bump for example, or just a bump in the road it makes a clunk kind of like a door is not shut all the way. Would that be the sway bar end links?
How do you check these? Thanks for info, Brian...
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