Chevy and GMC Duramax Diesel Forum - View Single Post - Noisy differential after fluid change?
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post #2 of (permalink) Old 04-12-2019, 10:45 AM
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Join Date: Apr 2014
Location: Alaska
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Originally Posted by GMCdiesel View Post
I replaced my differential fluid with Valvoline full synthetic oil and now my differential is noisy. It drives me nuts.
Should I just put AC Delco gear oil back in?
What oil are you using?

2015.5 GMC 3500 dually.
ive run mobile 1, valvoline and lucas at different points and saw no change in noise from the rear end. Did you maybe use the wrong viscosity? did you add any slip modifiers or does the fluid you purchased contain any?

2015 Chevy Silverado 2500 HD 6.6L LML
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