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1989 GMC Sierra transmission problems

Tiny
MAGGIE78155
  • MEMBER
  • 1989 GMC SIERRA
  • 75,000 MILES
Recently changed fuel pump, battery and sending unit. Removed the brain box and returned it immediately. Tried resenting emc by taking cables off battery. Everything starting and running great except now while driving the transmission whines and shift extremely hard. I changed fluid and filter with no help. Can you give me some idea of whats wrong.
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Tuesday, July 16th, 2013 AT 12:56 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
It sounds like shift perameters are off. It may have to go through a relearn if you had the ECM out. It should reset within 100 miles. Try that and see if it helps.
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Tuesday, July 16th, 2013 AT 7:01 PM
Tiny
MAGGIE78155
  • MEMBER
  • 2 POSTS
Thanks guys, but figured it out it was a loose vacuum line. Thank God. Nothing too serious.
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Tuesday, July 16th, 2013 AT 8:31 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
That's good news. Glad you got it working.
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Wednesday, July 17th, 2013 AT 6:13 PM

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