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Q:

transmission on 2001 Buick LeSabre

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
while drivining the car shift hard while driving. Then, while driving, at 70 mph the rpm went to 4 and it seem as though it wasn't shifting
(1) Answer
Sounds like a transmission issue, best to have a transmission shop look into this for you. I suggest looking for an ATRA shop near you, http://bit.ly/ATRA_Info