Nothing wrong with the trans itself, there were no problems, I rebuilt it before assembling the truck. Usually first few minutes shifting is slow in freezing temps. I shifted into reverse then first (it felt a little funky) then second, on the way to third it fell into neutral and the shifter just flopped around. Who knows, might have been cracked in it's previous life.
What a pain reaching and trying to compress the spring for the retainer, wound up making rube tool.