Three question marks is not a good subject line. Future searches for your topic will not turn up comments. If you edited it to read Attn Doodlebug owners, or something relevant to your interest, you would get more and better responses, I think.
Ditto on the title edit. It is important that information be available to future searches.
And, I do not own one at the moment but have had two of them. My last one had two 4 speeds and a two speed rear end. I calculated 34 forward and 8 reverse gears!
There is a club here in NH that builds them and competes with them in Doodle Bug Tractor Pulls.