I know they made them in gas or diesel, 2wd or 4x4 as well. Handy little tractor in their day. I have a 184, which is close in model number but thats about it, 284 is much more tractor-like with a standard rear PTO shaft and 3 point hitch, where the 184 has an odd-ball rear PTO and no standard 3 point (it was an option though). If I am not mistaken the diesel was made by mitsubishi...