Ok I spent all last summer/fall working on this 87 Shelby Z I bought from my brother. Altogether I've worked on the car for over 2 years but it was like a month of work on the weekends then I would quit for 3 months. Anyways, I finally got it running, run some brake lines, etc. Car start and idled just fine. Now the trans is all messed up and I need to pull it. It's got an A520 in it now because the 555 blew and my brother didn't know the difference so when the mechanic said a 520 would work he said ok. I'm still debating whether or not I rebuild the 520 or find a 555... but anyways, I need to pull it first. I have a Haynes manual but where do I start? I don't really trust the manuals much because according to it I would have pulled the intermediate shaft to install a starter (didn't have to!). Should I drain fluid, pull axles, pull tranny?