You would be suprised how many guys get them on backwards. They will last exactly 500 miles. There is a wheel side and a axle side. Last time I was up at Mosers they chewed me out for just that same mistake, so don't feel like a idiot, you have lots of company. Also don't run the inner tube
oil seals, race cars need the extra
oil on the bearings, and new seals also give you a slight horspower drag on the axles.
cobrashock