They really aren't that much different from what they are today. The 2165 has the same heavy duty hydrostatic, so its able to pull very well. The auto-gear was their manual transmission with auto clutch I believe. A very dependable heavy duty unit.
You will find that pretty much its going to compare to today's CC 2180 and you'll also find that aside from graphics, its essentially the same. The Vanguard is a jem of an engine, very strong yet quiet. Yours may have the 42" deck which hasn't changed, should also have the quick release feature. Hope that helped. /forums/images/graemlins/grin.gif