I think Ive got a spun hub on my 40 Gale 1960 APPR. I also have a mid 60s 4o Johnson with a good lower unit ,they are both manual shift [NON ELECTRIC] are they interchangeable,I realize that theres not enough info but I'm hoping the lower units on OMCs where the same for many years,I changed a 60 gale same period wit a similar horse Johnson and it fit perfect.THANKS DAVE S