Lately I've noticed this whining noise coming from the rear end of my 4WD Tahoe. It sounds VERY similar to tire noise but it isn't the tires. When coasting the noise disappears, and there is no noise when in Neutral. It is loudest from a stop to about 50 mph. The noise also doesn't happen when in Park revving the engine, nor in Neutral when revving the engine, so I'm guessing it also isn't transmission related. Any input on what to look at is appreciated. Thanks!
Whining noise from rear end only when under power
- Thread starter derekjl
- Start date
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sickk23
Full Access Member
I've had this same exact issue on my 08 4x4. Took it to the dealer once and they couldn't find anything. Didn't push it anymore, ended up getting rid of it for something newer. It was very annoying though.
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Sent from my iPhone using Tapatalk
Parthery
Full Access Member
I had the same issue on my 08 Tahoe 2WD. The rearend was shot at 60K miles. Was covered under the 5 year 100K power train warranty so didn't cost me anything.
If you hear the noise when you step on the gas that's likely what it is.
If you hear the noise when you step on the gas that's likely what it is.
SunlitComet
OBS Jedi-Do Good
sounds like a noisy rear end gear or bearing.
Should I just wait until it grenades itself or fix it now? I'm guessing a new rear end isn't cheap. I don't plan on owning the truck much longer than another year.
SunlitComet
OBS Jedi-Do Good
you can just tear down and inspect it. but perhaps at least change its fluid and read its condition for further diagnostics first.
Yukon John
Full Access Member
f you want to buy some time...put a pint of Lucas in the differential...usually quits things down nicely.
I believe 80w-90 was used last time it was changed. Should I use this in addition to an "additive" or just the fluid alone? Thanks. Both front and rear diffs take the same fluid, correct?
SunlitComet
OBS Jedi-Do Good
fluid alone and it is the same stuff in both.
When you say a "pint of Lucas", which one of their products are you referring to specifically?
