My bud had an Auburn and it broke after only a few trips to the strip. It was a street car that he raced on Mopar days at the motorplex. He contacted Auburn and they said they had problems from that unit and if he would send them his receipt, they would send him a new upgraded unit. He bought it new but from a swap meet so he was out of luck. I sold him a used 68 OEM with new clutches and he has not had any more problems. I'd call dr diff and buy a new one from him based on the OEM 68 design with clutches.