if your talking about hub seals then there should be a spindle seal & thrust spacer that the stub shaft passes threw. it what seal out water to the spindle support bearing in the tube of the spindle. then there are hub seals on each side that keep water out of the back of the hub. do not run with out. aside from that the only other seals in the axle are inside the tubes on either side of the carrier. you must remove the carrier assem. to replace. they seal to the shafts where they come in the tube to the carrier.