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Hello , I have a 4T40E transmission in my car and every time, i start driving it shifts fine and after a while it warms up and. My service light comes on ( no not the check engine light) it a car with a wrench icon. My car starts slamming gears and lately the rpms have to go higher before it shifts. Any help would be great. Oh and every time i turn the car off and then back on the light goes off , and the cycle goes again
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