I know this thread is a couple months old but I figure some guys can learn something about whats going on.
When I put Green axle bearings on my 72 swinger with factory SBP axles and a 742 case suregrip I had to trim the axles a touch because bolting the axles in with the green bearings caused the axles to clamp the thrust button in the pumpkin and it totally locked the rear tires together, tires squeeling around corners and everything, took the axles to a guy and he put them in a lathe and trimmed a bit off each one. Everything worked well after that.
I had read somewhere's that the axles had to be shortened by a certain amount to run those bearings.