ive read alot. and according to many people, they arent completely necessary..but its just added insurance that your gear oil wont end up leaking all the way out..with the inner seal installed there is no way for the gear oil to get to your brakes/tires..
also, although the greens are sealed bearings, theres still a chance that the thinner gear oil could make its way into the bearings and contaminate them..
somebody correct me if im wrong..but i believe i should still install them as added insurance..ive just done alot of reading on this, and that seems to be the thing to do
