Not shifting down

RJRT

MEMBER
2000 CHEVROLET S-10
4.3L
V6
4WD
AUTOMATIC
215,000 MILES

After the truck is warmed up when you get down to about 20 mph the truck doesn’t want to shift down to first on its own.

Thursday, May 21st, 2020 AT 11:38 AM

9 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good afternoon,

Does the transmission up-shift okay?

This sounds like a valve body issue.

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

when was the last time you changed the fluid and filter?

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

Is the check engine light on?

Roy

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Thursday, May 21st, 2020 AT 12:09 PM

RJRT

MEMBER
7 POSTS

Yes, it shift up fine. It’s just 0 to 20 that it has trouble.

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Thursday, May 21st, 2020 AT 12:25 PM

RJRT

MEMBER
7 POSTS

I am not sure about when the filter was changed, but it had new fluid a couple months ago.

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Thursday, May 21st, 2020 AT 12:29 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Do you mean from 20 to 0?

Did you change the fluid and filter?

Roy

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Thursday, May 21st, 2020 AT 12:30 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

I would still drop the pan and change the fluid and filter.

Roy

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Thursday, May 21st, 2020 AT 12:32 PM

RJRT

MEMBER
7 POSTS

Yes, I meant 20 to 0.

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Thursday, May 21st, 2020 AT 3:40 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Okay, I would start with changing the fluid and the filter. Look for any debris in the pan or on the magnet on the bottom of the pan.

If that does not work, most likely the valve body will have to come down and gone through.

Roy

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Thursday, May 21st, 2020 AT 3:42 PM

RJRT