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My k1500 has a 4.3 vortec with 4l60e trans with around 40k miles on trans. I drive 60 miles a day for work and after driving for more than a half an hour the transmission will down shift a gear randomly and the shift up while applying more gas. I have wondered if its because of my tires size(285/75-16) but i dont know. Hoping you guys can think of something i cant, thanks
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