To clarify this further. On the later 80 series birf...can't you just machine a grove in the end of the birf so that it will accept the c clip on the manual hubs? I'm using the 80 series axles also and going part time. But I'm not one to spend well over a grand on the correct hubs and birfs if I can just machine a groove and use mini truck/ 60 series hubs that I have laying around. They sure do look pretty in those pics but that some expensive bling.