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Gmt800 Rumbling Noise In Drivetrain

dbias

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dbias New Member

dbias

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Hey. I have a 2003 Sierra Denali with 80k. Have had no problems other than a front left wheel bearing going south at around 50k, around the same time the rear quadrasteer fluid had to be changed due to chatter in rearend. Anyway i have now picked up a rumbling noise "rumrumrumrum" coming from the front end, sounds like right side, but it only appears under acelleration. From 10mph on as long as the truck is under load the sound is their, but lighten up on the pedal to just before a coast or to a full coast and it goes away. It reappears as soon as accel pedal is push to reload drivetrain. The sound is a little more pronounced when turning left....(right wheel bearing?), but somehow this does not sound like when the left wheel bearing was going out but i may be wrong.

 

My wife's 2003 Yukon Denali had a case bearing go bad around 42k and from what i recall it was a similar sound but the sound was present even when coasting... from what i recalll anyway.

 

Any ideas?

Sir Dan Enthusiast

Sir Dan

Posted
Posted

Might be a dumb question but have you checked the fluids in the front diff and T-case? Just asking cause I know there was a problem with a slow leak from some earlier gmt800 T-cases due to an internal part wearing a pinhole thru the case. Not enough leaking to cause a big drip, but over time you run into bearing problems.

jdewolfe Enthusiast

jdewolfe

Posted
Posted

My dad's truck had the same symptoms. Turned out to be a bad bearing in the front end somewhere. I don't recall exactly where, but I know it was definitely in the front end.

dbias New Member

dbias

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Posted
Might be a dumb question but have you checked the fluids in the front diff and T-case? Just asking cause I know there was a problem with a slow leak from some earlier gmt800 T-cases due to an internal part wearing a pinhole thru the case. Not enough leaking to cause a big drip, but over time you run into bearing problems.

 

 

Im pretty sure the gear oil level is good as i replaced the seal and axle bearing on the right front a while ago, 3 months or so. Untill then i had always commented how dry the underneath of the vehicle was. no leak from anywhere until the right seal started slinging a little oil, not even enough to drip on the driveway but very noticable as it was very clean. I havent checked the tcase in over a year so I'll take a look at that Wed. when i get back to work at the fire station. At least in the station it is clean dry and warm. lol thanks

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