I have a 68 sportwagon that has been not running for a while. It runs fine now but the transmission will not shift out of 1st. Fluid is good and the trans does not have a history of problems.
I don't claim to have a lot of experience, but for what it' s worth, I would have a look at the vaccum line running from the intake manifold to the shift modulator and make sure it is clear and has vaccum to the modulator. If it has vaccum, I think the modulator could be at fault. Maybe someone else can help better.
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