. Matt , It would help if you get a shop manual for your year. Some are kinda lame but it gives you an idea of what your looking at. I don't know if yours is like mine a 68 Dart but your winow felts should pop out. There just clips. Pull your side panel off so you can see inside. Window regulator should be a scissor affair. Bottom edge of glass sets in a channel and is held inplace by plastic clips. Sounds like the hole regulator broke. if the other door is good you can get an idea from it. Try early A bodies on here or search for an old thread. Keep us posted on progress.