for some reason my front diff keeps locking/binding. all the parts are brand new. Gh aluminum case, 4 bevel gears and 30,000 weight oil. The axles bind up and lock together like the internal gears are binding up. everything is in correctly. I ripped it apart and rebuilt it but it still locks up. I don't know if the spacing in the case is somwhat wrong. anyone know whats goin on? thanks