1994-1997 have a speedometer pinion the harness plugs into, with a 2-piece output housing and a smaller output shaft.
98-2002 has a 1 piece output housing, with a larger output shaft and NO provision for a speedometer pinion.
There are some 1997 only 241DHDs that did use a 1-piece extension with the large output and the speedometer pinion, but very rare to find.
I have either early or late DHD. No '97s.
Mark.