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Just bought a 2008 Heritage with 8200 miles runs like a top but when I hit 5th it starts whining then shift to 6th it goes away. Any idea what it might be Thanks
 

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Just bought a 2008 Heritage with 8200 miles runs like a top but when I hit 5th it starts whining then shift to 6th it goes away. Any idea what it might be Thanks
Just a few years ago HD started cutting 5th gear differently to eliminate the whine. Think they went to a "helical cut" or something like that.
 

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Just bought a 2008 Heritage with 8200 miles runs like a top but when I hit 5th it starts whining then shift to 6th it goes away. Any idea what it might be Thanks

In a 2008 , fifth gear whine is normal . Try using some gear lube instead of oil, it'll quite it down some . :)
 

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I use 85/140 in the trans.
5th gear is straight cut which contributes to the noise. Remember the Muncie "rock crusher" 4spd trans. ? 4spds of whine!
 

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