Transmission slipping on hard pull on 2001 Buick LeSabre

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.

by in Morris, AL on September 01, 2010
1 answer
ANSWER by on October 14, 2010
Just go down hills

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