#1 - Your GS is equipped with speed sensing front suspension, That's what you hear, Normal...
#2 - This sounds like the tranny is not up to temp yet Revs higher and shifts a little harder when under 153 degrees farenheight, This occurs to rapidly warm things up If this occurs after warm, Drop and fill the tranny fluid 2 qts. Toyota type 4 or what you deem appropriate 2 - 3 times with a couple hundred miles between drop and fills Let us know results please, You know you have to post pic's of your ride, Right ?
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