4L80 without electrics. tailshaft swap
 

It seems like its this transission i have. It sits in a 91 suburban 4x4. Long pan, so i cant understand what other transission it can be.

I need this to go into a chevy van. This van have TH400 today. Does the tailshaft of an th400 fit this trans?
I have an 4L80E as well in a donor van bur its all the wires i dont like.. Can this tailshaft fit? ore do i have to take the trans appart?