It would have a 4.10 gear a 3100 and with an SM420 you would be driving it in 2nd, 3rd and 4th gear and your cruise speed would be the same as the three speed.
You would have no need for 1st gear unless you were hauling a full load of gravel or pulling stumps, and you would have the extra embarrassment of slamming the person sitting in the middle of the seat in the crotch when ever you shifted into 1st and 3rd.
DG


Denny G
Sandwich, IL