So I've been trying to track down where this hissing noise I was hearing on the highway. I originally thought it was my intake as it sounded like an air suction noise when accelerating at high speed but I have tracked it down to be coming from under my shifter boot and is only really making the noise in 3rd slightly but goes away when shifting to 4th then comes back noticeably when in 5th. Any clue what this noise could be? I was thinking some type of bearing or synco's? I have 134,000 miles and Trans. & Diff. Fluids changed last year ~12K miles.
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