Noise during 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 04-04-2011, 11:29 AM
simplesoft simplesoft is offline
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2006 Chevy TrailBlazer LS
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Cool Noise during acceleration

This is a 2006 TB LS 4X4 4.2L I6 with 196K. I am noticing a low frequency worble sound coming for the rear of the TB during acceleration, kinda like the sound you get from a bad tire. The sound disappears during coasting and deacceleration. I jacked up the rear and quickly checked for a bad bearing and noitced that I can move the drivers side rear wheel in and out slightly but does not do this on the passener side. Is this normal? I also checked the drive shaft u-joints and they look and feel OK however noticed the drive shaft at the transfer case end has a slight side to side play. Anyone have any thoughts as to what this acceleration sound could be?
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  #2  
Old 04-04-2011, 11:40 AM
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the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
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Some in/out play is normal in axles due to the C-clips inside the differential that retain them. More than about 1/4" would worry me, though. Have you changed the transfer case fluid every 50K as required? Might indeed be a transfer case problem. There should be no play in the driveshaft, and a bad bearing might have killed the seal and the TC could be low or dry.
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Old 04-04-2011, 11:43 AM
simplesoft simplesoft is offline
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Thanks, I'll dig deeper into the TC.
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  #4  
Old 04-04-2011, 08:27 PM
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Simon01 Simon01 is offline
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A noise on acceleration that disappears when coasting and deceleration is the classic indicator of a rear end issue also. Usually rear ends will make the noise in a particular speed range, like 40-45mph for example. Just sayin' that is another possibility.
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