Where did that come from John????? Maybe I'm not understanding
the question, but.....about half the 3100's and almost all of
the 3600's that I've run across have an SM420 four speed.
And the 3100's had 4.10 gears and the 3600's had 4.57 gears.
Denny Graham
Somewhere north of Sandwich, IL
Last edited by Denny Graham; 01/31/2013 9:57 PM.