2nd gear disengaging

[flathead47]

I would also recommend getting Mac Van Pelts book , shows you how to disassemble , reassemble , determine what parts are worn and need to be replaced.
You may want to talk to members of the Vancouver Fraser Valley RG#120 Early V8 Ford Club as they are in your area.
Look for a spare transmission to familiarize your self with and rebuild it.
They should be available in your area as lots of these vehicles do get modified
Regards,
Flathead47