Manual valve body

That's not the question he asked, for me not an option, AND "change the shfiter" problem solved.

I've run manual gearboxes for the majority of my life, no longer can do.

Yeah. People who haven't had knee pain don't know what it's like. It'll bring you to you knees.....pun intended. Mine have been giving me trouble now for about the last year......but the rat truck still gets a 4 speed if I am able to keep it. I don't need to use the clutch to shift anyway.