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Tranny Acting Funny


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Well first off I have a 2009 Sierra with 20k miles and the 6-spd tranny and 3.42's.

 

Today I was rolling down the intrestate about 78-80 with cruise on. No winds or anything. Well I start going up a hill and of course the truck grab another gear to get up it in cruise. It gets up to 2500 RPM. Then usually you come off the hill it kicks back down to under 2000 RPM. Well my engine would make the noise and slight feel of kicking down but RPM stay at 2500. So I take off cruise and it finally kicked down on me. Sometimes the RPM on it on but after 5-10 seconds after the engine noise of revving up.

 

I just got 285/70/17 put on a week ago and have had it on the interstate since then and I hasn't done this. Anyone have ideas?

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