Custom Two Speed Gearbox

[Adam.garcia]

Hello All,

I am currently working on a custom two-speed transmission for an offseason 6 Wheel WCD.

The design intent for this drive train is to keep the gearboxes as light as possible, while obtaining a very high speed (18-22) and a moderately low speed (4-6).

These are the gears I'm planning on using.
http://wcproducts.net/gears-20-dp/


Available CIM gears: 14
Available Spur Gears: 15,28,30,45,48,56,60
Available Dog Gears: 35,45,48,60

I have been having trouble producing the desired gear ratios. Can anybody who is experienced with designing gearboxes of this type help me figure out a set of gears that will produce our desired result?

Thank you in advance!