Th350 question

[Texasz71]

First post. Long time lurker, first time poster.

So I recently bought my first square body.

1975 k10. 400/350/203

Previous owner said it needed some TLC, and I was ready for a mediocre project.

So right off the bat, the th350 wouldnt shift from 1-2. It had 1 and reverse. So after googling, I replaced the vacuum modulator. It has vacuum at idle. Still no shifty. Next I pulled the governor. Turns out, the plastic gear had broken off. Got it out (nightmare), then put a new plastic gear on. The piston was moving freely. Still no shifty. So I noticed the trans pan was dented and had a slow leak. So I just got finished swapping the pan (one with a drain plug), and added fluid. Fluid level is perfect. Still doesnt shift.

After hours and hours of googlin, I come to yall for other suggestions.

Thanks in advance