If it's any help, I'm told the Servi-car gearboxes are identical to the
relatively common WLA (WW2 army bike), with the addition of reverse
gear. All WLA gearboxes have provision for reverse - a friend has one on
his sidecar outfit.

Jordan


Harley and Cushman cart
transmissions are hard to find and even harder to find specs on them.
More searching must be done.
Eric