Transmission shifts fine when truck is cold

1993 CHEVROLET CHEYENNE
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TRIM1970
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My daughter's truck will shift fine when the truck is cold but when it gets hot it will not shift into 4th. Any suggestions as to what would be a possible cause? Could the cause of this be a solenoid? If so which solenoid... A or B? I have also read that it could be the pressure switch. Please help!!!! Any help would be greatly appreciated!
Sep 14, 2013 at 12:36 PM
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HMAC300
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have a trans guy scan for codes and give an opinion, it may be the toque converter clutch doesn't operate any longer. or it cold be a valve body problem. not so much a solenoid cause if it worked cold it would work hot as well.
Sep 15, 2013 at 5:45 AM
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TRIM1970
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Thanks for the quick response on my question..... But I was wrong with the information in my question.... It slips out of drive when the truck warms up and goes to low gear. Would the possible solution still be the same?
Sep 24, 2013 at 2:35 PM
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HMAC300
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yes cause it sounds like it's an internal problem anyhow either governor or one of the valves
Sep 24, 2013 at 4:17 PM
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TRIM1970
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Thank you for your help and quick response, I appreciate it!!!
Sep 24, 2013 at 5:59 PM