I've broken down a few. I went through three transmissions for my '84 Chevette before I found a decent one. I broke all the bad ones down before I scrapped them. It was a learning experience for me because I like to see how things work but it helped out my bottom line as well. I got dirty aluminum prices for the cases though because it had iron plugs, pressed in bearings, etc. still in it that I couldn't remove. If you have the necessary tools to get it all out, I'd recommend doing it. If its an old transmission, the case is going to be cast iron, not aluminum but it still may have some brass pieces inside.
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