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Has anyone else with an auto 11 GT had the rear wheels screech after a downshift while going around 65-70 with grade assist on?

Had grade assist on and all advancetrac on also, cruising down the highway around 65 accelerated slightly to about 70 and let off the gas and I guess I hit right about where it thought I wanted to go a lot faster so it downshifted right as I had let off the gas. Rear wheels basically locked up real quick, screeched real good and decelerated then up-shifted. Didn't lose any control but I think I might have pee'd a little.

I generally do not drive on the interstate with grade assist on but sometimes I forget I turned it on in the city. This was the second time. The first one wasn't nearly as bad.
 
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