I've think to put the 2 speed of my DM-one (16/20 on the bell and 44/48 on the spur), but i've change the stock rear diff ratio (13/43) for a bullet proof CEN GENESIS diff (9/26 ratio).
Presently, my center spool is a 46 spur on it, and i plan to use a 12T clutchbell.

So i don't think that my DM-one 2-speed ratio will work with my CEN 9/29 diff.

I'll try it with the single speed, and if i need some more low end grunt and top speed, i'll put it back the stock Ofna diff ratio (13/43) with the two speed.

But originaly, this two speed was design to work with little 4.2" on-road wheel, and now i've large monster truck paddle.

My only option will be to find an other set of clutcbell gear, maybe 12/16. but not sure if i could find this gear.

But another think to take in consideration, i'll not only drag race with this puller, but i'll use it to play in sand pit too[>:]

David