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Old 03-07-2018, 09:57 PM   #1 (permalink)
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4hi loud noise when stopped

Snowed a few inches today producing some icy roads. Went into 4hi before taking off. At the first stop light a loud rattling noise came from the mid section of the truck more towards the front end. I put it in nutrel for a moment and it stopped immidiatly . Afterwards I took it out of Hi for the rest of the ride home. Any thoughts? If it is the 4x4 mech any way to test it to confirm?

Driving a 2010 GMC canyon 2.9 sle reg cab

Thanks!
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Old 03-08-2018, 11:16 AM   #2 (permalink)
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I have seen a Chevy Trailblazer of the same vintage do something similar. Whenever he put it in 4WD on pavement (even in wet or snowy conditions) or on very hard-pack dirt, he would get those horrible noises every time he attempted to turn.

If the surface isn't totally slippery (ice/mud) the axles bind very bad in 4WD when you attempt to turn. The owner was told by GM that It was the nature of the beast with the 4wd systems in those vehicles. Obviously, having 4x4 in a mall-rated vehicle like that was an afterthought for the designers.

In colder climates, a lot of folks put their trucks in 4-HI and left it there all winter. These vehicles had very short-lived transfer cases.

Also, you vehicle was built almost a decade ago. Has the transfer case been serviced? Does it even have fluid? If it starts making noise in 4WD when you take off from a stop (apply torque), that could be a bad u-joint.
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Old 03-08-2018, 12:01 PM   #3 (permalink)
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Do cayons/colorados share the same drivetrain are the envoys and trailblazers?
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