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partsfan - talk to your local hd sevice dept. I know 5th gear in the 2010 trans changed from a spur cut to helical (think I got that right). Anyways 2009 and earlier had a noticable whine in 5th as you are probably aware. But hey, it reminds you to shift on up to 6th. Many a time on my 2010 did I look down at the speedo and tack and say "crap", and then shift on up to 6th.