Subject	Slight rear diff whine.
Posted by	aquariuscsm on August 21, 2014 at 1:40 PM
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Message	I've been getting a slight rear diff whine from 50mph and up. Been doing it for a few months now. Would a thicker gear oil help? I've been using Amsoil AGL 80W90 for the past several years. After a switch to Amsoil Severe Gear 75W110 there was no change in the whine. Would a mineral oil 8W090 be a good option to try,or maybe a synthetic 75W140? I've been doing a lot of research on the fundamentals of GL5 (EP) lubrication,and some sources say to either move to a mineral oil (since it has different characteristics than a synth) or to a 140 weight synth (but not to a 140 weight mineral). I have a document from Lubrizol saying an 80W90 mineral spec can be substituted with a 75W140 synthetic spec,but I was just wanting to get some opinions on this subject with anyone who has experience with this issue. Thanks in advance!
Follow Ups	Slight rear diff whine. - aquariuscsm 13:40:09 08/21/14 Is the whine noticed at steady cruise throttle only?>> - ZUL8TR 06:02:10 08/22/14 Re: Is the whine noticed at steady cruise throttle only?>> - aquariuscsm 20:11:11 08/22/14 Whine under load is a sign of worn ring and pinion. >> - ZUL8TR 15:05:57 08/23/14 You sure it's the diff and not a wheel bearing? (n/m) - 300ZMang 10:16:24 08/22/14
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