the unit itself I could not find, just the picture. i asked the website owner and they were in brazil. he told me that the units are common but he doesnt know where it came from and if i find it let him know.
Id imagine this can be made.
you can find the pulleys for chain driven on
http://www.linngear.com/products/highlights/infosheets/i-1.html
belt driven pulleys are there too.
drill out or get a pulley with a shaft size big enough to press in two bearings. one for the axle that it will run on and one for the traction motor shaft to key into.
have a plate that the axles are welded to.
the other one would have the two bearings, one for the pulley and the other for the splined shaft for the yoke to be put on. then a short drive shaft to the yoke of the rear end. have to have drive shaft because mounting the motor to the rear end would probably mean that the motor would be shaking and motors do not like to be shaken (but not stirred lol)
someone tell me if my thoughts are right here, I am just pulling this picture out my head and could be completely wrong.
and someone tell me why these transmissions have not been tried before?