Rear differential drain.
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Junior Member
Joined: Apr 2019
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From: Washington
Rear differential drain.
I’m new to this forum and new to being aI have a 1990 f350 and I’m doing a rear differential fluid change and I was previously told I should use 80/90 gear oil but I keep coming across 75/145. Can someone please give me a little more info on what gear oil I should use. Thanks Nicci.
Last edited by Nicci Hughes; Apr 17, 2019 at 04:28 PM.
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