Q: Truck won't accelerate past 35mph

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Suddenly for no reason my truck won't accelerate over 35mph it's a 4wd 4spd tranny with a 350. She accelerates through 1st 2nd and 3rd without any issue up to 35. When I shift to 4th she just stays at 35 no matter how much gas I give. How do I fix this issue?

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