Assuming you mean an aussie 4spd not a Muncie or Saginaw they do, it is a whole bellhousing, just be careful of what you are putting it in though. One of them (Dellow I think) has longer bottom bolts required and won't work with HX-early HZ or LH-LX clutch mechanisms.

http://www.rodshop.com.au/trans_conv.../bh/bh-044.htm