Guys I would like some input from you all. I need to know what kind of transmission to go with my 51 chevy 3100. I see a lot of 700 r4's. I would like to know everyone's opinions, and the pro's and con's. I would like to have a reliable durable automatic transmission. What is the difference in the 700r4, and the 4l80, 4l60, etc. thanks