'90 E4OD wont shift properly

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Hway

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I have a '90 full size with a e4od transmission.I had it running doing 70 that was 2 years ago. I had to let it sit for a bit because of my surgery, then I took it out for a spin and I can't get it above 35 again.
I have changed parts over time.
I have changed the sensor on the pumpkin, changed the speedo gear, changed o2 sensor, alternator and a few others.
I even had it at transmission shop, they said it wasn't getting enough power but it was good.
Then I hit a bump then it was working right.
However since it sat for 3 months I can't get it running right.
 

Tiha

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It sounds like it is an engine issue, not a transmission issue?

Not enough power to get enough speed or rpms to shift? Does that make sense.

Or what is it that makes you think it is the transmission?
 

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