Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.
Does the noise change when turning?
Noise does not change when turning or braking. Different gear does not make any difference. Noise is not present with vehicle on lift even at 30mph on speedometer. We have replaced all items on driveshaft. Noise starts at 25-27 mph and continues until about 37 mph then is gone. Squeal is rotational meaning it is on something that is turning. We have checked all wheels, brakes,etc. for contact spots and find none.
If you checked all that then it stands to reason that the noise is coming from inside the transmission itself.
I would concur except that it sounds external, meaning that it sounds comparible to the noise you hear when the warning tab is hitting the brake rotor when the pads are worn out. Very high pitched and not all that loud. Must have window down or door open to hear clearly. I was a GM certified tech for about 15 years but that was20 years ago. This has me going nuts. Sounds like coming from center or rear of car. Not there all the time.
Yes. Sorry, should have told you that before
rear CV's good?
Yes, all check out fine. When driveshaft is out, turning real wheels by hand rear end is absolutely quiet and smooth and cv's are tight.
no chance it is a seal making noise?
can you apply some oil external to the seals and see if the noise stops?
Possible I guess, the hard part is it will not make noise on the lift no matter what you do. Seems to have to have a load on it. Never have had one like this. Glad I'm too old to be a tech now.
Oh I misunderstood
I though it did it on the lift.
so if it does not then it is a wheel bearing I think, the seal inside making noise.
Could be I guess. We will try to check that out. Please keep this in mind and if you have any other ideas, please e-mail me. Thanks for your help.
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Thanks for your help. I will let you know.
need help on a 1999 Chevy K3500 pickup with a 7.4 L