I drive a 2011 GMC Sierra 2500HD ex-cab 2wheel drive with a 6.0 gas engine and a six speed 6L90 automatic transmission. I have started noticing what I believe is called "shudder" from my tranny under fairly heavy acceleration or going uphill. Its just like the noise you hear when you accidently get across the white line on the passenger side while on the freeway and hit the "rumble strip". How can I be sure thats the problem and is there an easy fix?
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