I wouldn't lock a c-clip axle even with a lunch box locker. Had a buddy in the club runnin 33's, he did really good never broke nothing. The first run he went on after he put a lock right in he busted an axle!! Had to strap a small log to the jeep to keep the wheel in while he limped back to the trailer! I run 35-13.5's with an open rear and have no problems but I won't lock it up till I get my 8.8 built!!