What do I need to replace a transmission on a ford explorer?

I'm getting a 94 or 96 ford explorer and need to replace the transmission (only goes in reverse) what parts (other than the transmission) do I need to order. Also can you use a different year transmission? I'm trying to find a used one. Thanks!What do I need to replace a transmission on a ford explorer?Pretty much just tools.And a new filter for the tranny you're putting in.Fluid also,but that's about it,be care full with the lines going to it though,you mess them up there's more$ you have to fork out.