F75 1990 Diff Whine

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Hello I have just bought a 1990 fourtrak which runs very well and everything appears to work ok, but the rear diff whines at anything over 50 mph, does this sound like a major problem?
Any help/advice greatly appreciated. Thanks

really the sign of a good

really the sign of a good diff is a nice healthy whine in about third gear doing slow speeds but over 50 seems excessive - is your 2wd-4wd selector clicked in properly?


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F75 1990 Diff Whine

Thanks for your answer pauldoubleyou, I will listen more closely tomorrow from low speed in third and check, the misses is always telling me I'm a deaf old sod anyway.