Have Transmission Questions? Ask a Mechanic for Answers ASAP
Any earning lights on, and codes stored?
Does it make no effort to shift out of 2nd or does 3rd act like neutral?
Below are the diag steps for no 3rd gear.
Have you done an air test on the clutches to see if the concern is within the transmission or in the valve body?
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Based on that information, getting into the transmission to check it out internally looks to be the next step here.