Mack drive hub axle studs pulling threads

My '77 RS600 seems to be stripping the drive hub studs for the axles. Not sure why this is happening. The Mack dealerships solution was to drill and heli-coil for fine thread bolts.



Is this a common issue?



Maybe an actual gasket (vs only silicone) between the hub and the axle shaft would give a better friction surface and bite to resist movement?



Thanks