Bad rear diff howl
#1
Staging Lane
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Bad rear diff howl
2005 CTS-V with 90k miles. Terrible loud howl at highway speed coming from the rear. I hear it basically anywhere above 50 mph. It will still howl at 50+ mph when in neutral. There are no leaks that I could find after getting under the car and checking the rear out. The diff fluid hasn't been changed in probably 25k miles so a fluid change with maybe LSD additive would help?
What other tests can I do to nail down the root cause?
Is it possible that the rear is on its way out?
What other tests can I do to nail down the root cause?
Is it possible that the rear is on its way out?
#4
TECH Junkie
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If it's just noticeably noisy it's probably OK, if it's screaming loud, then something's wrong. Change your fluid and put some heat wrap around the adjacent exhaust pipes. I've found that the hotter they get, the noisier. I barely notice my whine anymore with it heat wrapped.
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#10
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Thanks guys. The car does have an 07 rear in it. I will try a fluid change. If i didnt know any better, sometimes i hear the whine and sometimes i dont. Maybe ive lost my mind lol!!! Will keep everyone posted