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Torque Converter Shudder, solenoid or TC


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I have 2012 Sierra 5.3 with a 4l60e trans. As of lately there has been a shuttering raging from 30 to 40 MPH . Its like going over the safety bumps on the side of the road. Its not the tires or the U joints, i ruled those out. Im thinking either the Tc itself or the solenoid is bad. If i keep it at 30 it will shutter and when I press the brake to see if it stops , it wont, the shuttering will continue . When i turn the tow mode on, the shutter will disappear. Any input would help. Thankyou

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