Why won’t the new used transmission shift?

I just completed a transmission swap and my car only has drive and reverse, no first, second or overdrive.
Could this be an electrical problem or still a transmission problem?
The swap was because the old trans didn’t have reverse and some loss in power.
Now I have reverse and still no power.
Please help me understand why.
Thank you.

Make sure you have all electrical inputs wired into the new trans. The trans will not know when to shift without all its electrical signals. Those are generated by the computer that processes the cars vital signs, including temperature, load, RPM, etc.

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