Rear end clunking noise - 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 09-11-2009, 02:58 PM
bfrench's Avatar
bfrench bfrench is offline
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2005 Chevy TrailBlazer LT EXT
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Rear end clunking noise

Hi, Guys,

I did a search and found some answers but I'm not sure if it applies to me.

As I accelerate out of a slow 90 turn or while slowed down to approximately 10 mph and accelerate again - I get a one time clunk type sound which seems to be from the rear of the truck.

I bought this one as the second owner - first owner sold it after 10,000 miles - an older gent who then bought a smaller car so I don't think he did anything hazardous to the vehicle - it is now just coming up on 30,000 miles and has spent most of its life on pavement.

I've put the Suspension Max lift in the front and added 25579r17 tires as the only mods.

IIRC - it's been like this since I bought it and has always been nagging in the background of my mind, so I figure it's time to have it looked at before it goes much farther.

Has anybody had this type of occurrence? Anything to worry about? Service guy I made an appointment with for Monday suspects rear stabilizer mounts.

Also should the differential fluid be changed or just topped up if needed?

Thanks,
Bill
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  #2  
Old 09-11-2009, 03:14 PM
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2004 GMC Envoy SLT "Roadiemobile"
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For the fluids - follow the Owner's Manual recommendations. The differential is not half as important to change at 50K as the transfer case fluid. That's IMPORTANT to do.

I've seen broken stabilizer bar mounts, loose end links (loose nuts, not worn out joints), loose panhard bar bolts, loose upper and lower control arm bolts, and loose shock mounts. All potential noisemakers. Less likely is a bad ujoint or driveshaft front slip joint that needs greasing.
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  #3  
Old 09-11-2009, 03:32 PM
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If its what I think it is, its normal.....every TB/Envoy I've driven does it. Basically you've slowed to the point where the transmission is thinking down-shift and has most likely shifted into 2nd and is about ready to shift to 1st gear. (10 mph is 1st gear territory). You apply throttle and get a thump/thud or clunk type sound. (Depends on your interpretation of the noise). What is happening is that the transmission is in the middle of a no-torque applied downshift when you get back on the gas, which results in a rather harsh 2-1 down-shift. Mine does it, not as bad since the tune a couple years ago, but still occasionally does it. Every rental/loaner and every Envoy/TB my friends have had did the same thing. Its a characteristic of the 4l60e transmission series coupled with a drivetrain that has some lash in it.
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  #4  
Old 09-14-2009, 06:46 PM
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2005 Chevy TrailBlazer LT EXT
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Rear end clunking noise

Hi, Guys,

Well back from the dealer where I was able to demonstrate the noise to the tech rep and his diagnosis is that it is normal with our trucks - says it has to do with the differential backlash setting.

They also checked it out physically and made certain the fluid level was ok - it didn't change a thing.

Just as an interest point - mine happens between 20 and 24 kph (12 and 15 mph) - decelerate to that speed and then accelerate normally - I then get the rear end clunk noise every time.

So now I'm a little more cautious about accelerating out of that speed range.

Thanks for the answers,

Bill
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  #5  
Old 09-14-2009, 06:59 PM
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I purchased my trailblazer with around 30,000 miles and it now has around 80,000 miles. It has had the same noise eversince I bought it. My dads 2004 chevy truck does the same thing ever since he purchased it also. I guess its just the nature of the beast.
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  #6  
Old 10-21-2009, 02:16 PM
andy1974 andy1974 is offline
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i can confirm that sound, i also have that as well. 2004 Trailblazer lt here.
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  #7  
Old 10-21-2009, 02:39 PM
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I know Roadie said it's less likely (so I'm afraid to even say it lol) but my friend's Suburban had the same issue - he changed the u-joints and it went away.

Just a thought, since u-joints are cheap enough.
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  #8  
Old 10-21-2009, 02:52 PM
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kmcleod60 kmcleod60 is offline
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same sound here also
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  #9  
Old 12-29-2009, 05:59 AM
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raymil515 raymil515 is offline
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Unhappy same noise here with '04 but..

I have a 2004 TB LS that seems to have the same problem, however I also have an 08 LT with 36k that has NEVER made this sound. My 04 has 85k and when you accelerate after breaking breifly (such as going around a corner) I get a clunk from the rear end. Im not sure if I did'nt notice it as much before or it has gotten worse but my 08 has never done that. I can slow to around 20mph and gun it and it just takes off...no clunk, and no lag...
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  #10  
Old 12-29-2009, 12:46 PM
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Make sure all of your five links in the suspension are mounted tightly - no loose bolts. And the shocks.

Consider removing the driveshaft and greasing the slip joint at the front end - this should be regreased every 3-4 years, IMHO. Search for a thread with "feeling of being bumped when stopped" as the title for more speculation.
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