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Will not shift to high gear

Tiny
REDBONE
  • MEMBER
  • 1993 GMC S15
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 176,000 MILES
Changed fluid and filter in the transmission. After I finished I took the vehicle for a test drive and the vehicle wont shift in high gear.I tried to shift it manually and still wouldn't shift to drive.I get to 35 mph and the vehicle does not shift.
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Monday, October 21st, 2019 AT 2:27 PM

5 Replies

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

Did you have this issue prior to the fluid change?

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

Roy
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Monday, October 21st, 2019 AT 5:12 PM
Tiny
REDBONE
  • MEMBER
  • 92 POSTS
No problems before fluid and filter change.
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Tuesday, October 22nd, 2019 AT 1:02 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, was there any debris in the pan on the magnet?

Roy
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Tuesday, October 22nd, 2019 AT 2:48 PM
Tiny
REDBONE
  • MEMBER
  • 92 POSTS
There was some debris on the magnet and the fluid looked dark brown.
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Thursday, October 24th, 2019 AT 11:32 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Not good.

I would replace the fluid several times to get rid of the bad fluid.

Roy
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Thursday, October 24th, 2019 AT 11:55 AM

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