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Transmission shifts hard

Tiny
JANDC
  • MEMBER
  • 2003 CHEVROLET ASTRO
  • 4.3L
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
After driving at 70 for 5 miles transmission shift 1-2 hard like a race car. TPS?
Friday, March 26th, 2021 AT 11:41 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

The TPS controls shift time, not shift quality. That is mechanical from the valve body.

https://www.2carpros.com/articles/automatic-transmission-problems

I would start by changing the fluid and filter and see if that helps. Beyond that, it is the valve body itself that may have a broken accumulator spring.

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

I attached a picture of the location of the spring.

Roy

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Friday, March 26th, 2021 AT 3:55 PM
Tiny
JANDC
  • MEMBER
  • 5 POSTS
More info: after parked for hour or so then transmission shifts normal.
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Saturday, March 27th, 2021 AT 5:34 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, then it is something with the valve body.

Start with the fluid change.

Roy
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Saturday, March 27th, 2021 AT 5:35 AM

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