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I-5 Transmission, will not shift from 2nd to 3rd without letting off the gas pedal

WHAT WOULD CAUSE THIS???
 

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I-5 Transmission, will not shift from 2nd to 3rd without letting off the gas pedal

WHAT WOULD CAUSE THIS???
My truck does this after I drive it hard for a while. It is holding gears for better performance. If you drive like a grandma for a while it should settle back down. If not, disconnect both battery terminals and hold them together for 30 seconds or so to initiate a re-learn.
 

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I know nothing about transmissions but I have researched this problem extensively . The condition you describe is classic fried 2 /3 clutch pack according to my searches .You may want to try what BDiano stated and see if that works . Then I would do a pan drop and filter/ fluid change . If those things don't work it may be rebuild time .
 
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