I have a 1925 Model TT which I am restoring, and the auxiliary stick-shift transmission was always referred to as a Jumbo transmission. But now that it's all disassembled, it turns out not to be a Jumbo after all. The name "Riverside" is cast into it, but I can find no reference to a Riverside transmission on the web. Anyone have any ideas? I will upload some photos later.
I think you'll find that if you compare it to a Muncie aux. trans they are the same.
Yes, that would appear to be the case. Thanks!