1993 transmission

[roellchevy]

I have a chevy 1500 4x4 z71. I have looked and am unable to determine what trans comes in the trucks. its a automatic right now I have 1 2 and r. when it first acted up I had only 3 and 4 gears. I replaced my filter and fluid and the 2 cheap shifting sensors to see if that would give me my gears back it didn't. so I found a 1997 4l60e trans and was wondering if that would work in my truck? and if so can my transfer case bolt right up as its a 2wd trans? I am also working out a no start issue non of my spark plugs are sparking have new cap and wheel any help will be great!