rayS197
Senior Member
They are safety hubs that retain the wheels in case an axle or differential breaks. There is a C Clip that holds the axle in place. They are required at a certain ET I think its 10.99 or something. Some say they are not necessary cause of the rear disc breaks. Better to be safe than hit the wall @ 100 + mph. Anything can fail. take measures to prevent it is my opinion.