Differential light whining sound

2015 RAM 1500
155,000 MILES • 3.0L • TURBO • 4WD • AUTOMATIC • DIESEL
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HPCISNE
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  • 2 POSTS
I started hearing a whining sound coming from my differential. I suspected rear wheel bearings, but there is not play in either hubb. I'm going to replace the gear oil today. I noticed it calls for SAE 75W-140 Full Synthetic. Can I use SAE 75W-90 with limited slip added?
Aug 24, 2026 at 10:47 AM
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