Hey guys I’m new here. I have an 04 Yukon Denali I just picked up. Been doing some stuff to it getting it ready to roll and I have this humming sound when I push the throttle, and when I’m slowly coming to a stop. I can feel it in the steering column too. I would attach a video but I’m not sure how to do that. Hopefully someone has had the same issue and can point me in the right direction. I did a trans service and it didn’t get better or worse. Thank you!
Help identify a sound
- Thread starter Tf79
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Welcome to the Forum from NH.
Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.
I hope that you will become a participating member in the Forum's discussions.
Pics of the truck, please.
Post your video to YouTube or some other similar uploading site, and then post the link to a new entry in this thread.
Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.
I hope that you will become a participating member in the Forum's discussions.
Pics of the truck, please.
Post your video to YouTube or some other similar uploading site, and then post the link to a new entry in this thread.
When moving. Around 40 mph transmission is in 4th and even lightly touching the throttle, it makes the sound. I’ll post the video right now
And it doesn’t have to be at 40 exactly, that’s just when you can hear it best
Here you can hear me feathering the throttle. When I let go of the throttle it stops. But if I press on it it comes back. Also noticed yesterday coming to a stop it sounds like a lower pitch version of this and it slows down with the truck slowing down.
sounds like the pinion bearing making noise, has any work been done to the rearend?
Nope just got it. Was going to go and do the service on the front rear and tcase. Just did the trans and a couple solenoids. Really hope I don’t have to fix the diff. I’m already doing the rear main seal and plate this weekend! lol
that's just what it sounds like to me if you are just cruising and not hitting the brakes
but you could get under there and take a look at the u joints, parking brake, etc basically rule stuff in or out
you could also grab it try to wiggle it and see if it has any play at all, shouldn't have any, if it is leaking that's usually a clue
also check the differential fluid level, should be up to the fill hole or a hair under if it has a regular diff cover
I’ll check that and update tonight
rockola1971
Full Access Member
Yup sure sounds like a pinion or axle bearing getting loaded up on a pitted race. They typically get noisy the most when letting off the throttle. Id be inspecting diffs for glitter!!! There is also a chance that a bearing in the BW AWD unit is the culprit too! I dont envy your future of laying under there in this heat for all this!!!
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That’s what I don’t get! My only challenger was only noisy when off throttle when the diff went bad. I checked fluid all is well. Tomorrow I’m gonna start doing the rear main, I’ll check the tcase when I drop it all to see if I can find anything
Lil Timmy Shy
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Check your front hub bearings. That's what mine was doing and it turned out to be the right front hub (4X4).
Bump for people looking for an answer 5-10 years from now, I’m 98% sure it’s coming from the awd t-case, but I’m not going to pull the tcase apart. I have checked everything else in the drivetrain and nothing else is out of spec and is working as it should
rockola1971
Full Access Member
Dont be scared of a Tcase. They are stupid easy and there arent alot of parts inside them. They are not near as complex as a transmission. Tons of videos on youtube on disassembly and reassembly.
lol I’m not scared I just should have taken it apart already when it was out of the truck when I did the rear main and I don’t want to take it out again
rockola1971
Full Access Member
They are really scary when they lock up and chuck the chain out the side of the case. Even scarier when they try to rip the backend off your tranny. The bill for both scenarios aint pretty. The typical noisemakers in a Tcase are the chain stretched and rubbing the case and a bearing/race going to see the gods.
The sound I posted, does that sound like the tcase? I haven’t found any other issues the only thing I could think of was the tcase internally
