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Transmission slipping on hard pull on 2001 Buick LeSabre

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I have noticed my transmission slips when I go uphill. I have noticed that the transmission is not down shifting and then it will begin to slip. Also my gas mileage has dropped from 24-25 mpg to 20-21 mpg. I have had the codes run on car but nothing comes up.
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