automatic transmission but will only shift manually?

1993 CHEVROLET SUBURBAN
230,000 MILES
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CONWAY01
  • MEMBER
  • 2 POSTS
I have a 93 suburban 1500 4x4 with automatic transmission but will only shift manually the speedometer seems to work normal do you have any idea on what could cause this? had a small leak in transmission cooler lines we fixed but wont shift up or down in drive r overdrive..
Nov 25, 2011 at 5:01 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Has the check engine light come on? Was it shifting properly before the leak?
Nov 25, 2011 at 5:03 PM
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CONWAY01
  • MEMBER
  • 2 POSTS
yes the check engine light is on yes it all worked fine befor the leak
Nov 25, 2011 at 5:05 PM
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