1929 real axle seal/bush in Buick - Pre War Posted November 4, 2017 40 minutes ago, raydurr said: Is the differential overfilled? If so , excess should go out the spout on the backing plate , unless some of the bearing shields or other sheet metal parts are damaged or missing. Make sure spout is clear and not blocked. If replacing the seal, silicone could be applied between the brake drum and the shield attached by the 6 bolts. This may slow the leakage some. Thanks, I have not checked the spout so that's my next job. Many thanks for your help. The axle nut was tight locked by the lock washer.