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2004 Chevy Impala Transmission shifts hard

Tiny
ROBNSONCS
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 80,000 MILES
Last month I had the transmission serviced at my local dealership (they flushed it). About a week later I noticed that the transmission started shifting hard. But this only occurs after I have been driving a while. It seems to shift fine after it's been sitting for a while or overnight. I've checked the fluid level and it's fine. What could be the problem?

Thanks,
Chris
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Tuesday, February 12th, 2008 AT 3:34 PM

1 Reply

Tiny
DENNYP
  • MECHANIC
  • 1,824 POSTS
Have it scanned for trouble codes. You might find a p1811. It is possible that some debris was loosened up in the trans and plugged up in the PC solenoid. That will cause max line pressure and give the hard shifting.
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Wednesday, March 17th, 2021 AT 4:23 PM

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