Need transmission help

[Matt Man]

So I finally got around to installing my deep transmission pan with a drain bolt and I was going to service the trans anyway since I have never done it in the 3 years I have had it. It started to shift more and more firm so I thought I would put the new pan on and have some fresh fluid mixed with the old. I know what COULD happen if you service a old transmission. Anyway, I got the pan off and the fluid was way worse than I thought it was was very dark brown in color and had metal shavings in the pan.

This is not the picture I took, but it looked very similar to this inside:
http://67-72chevytrucks.com/vboard/a...1&d=1522033445

So I put the new pan on and the thing leaks through the casting through a pinhole GREAT. So I ended up pulling the new cover off and just reusing the old one. The shifts are more smooth now but the converter is constantly locking and unlocking which also makes the truck jerk violently. Also, the truck sometimes will die when I come to a stop. So I guess the question is am I looking at a rebuild in the near future? The transmission is a Turbo 350c on my 81 k10.