They didn't release any HJ's in the US that I'm aware of, I'm sure a few have been imported. Sounds like the perfect axles though. As for Mini-truck birf's in an 80 housing, the knuckles are too big and the trunion bearings wouldn't do their job. The 80 birfs are bigger and so are the knuckles. As so the spline count, I can't remember sorry.
