[cobrashoch]

Craig - I believe RH has it right. But I also think you will most likley bust a axle where the splines meet the axle. If your axles are resplines I'm afraid you may be setting yourself up for a rapid forced turn. Even a hardened racing axle will only take the abuse there for a while. You can help reduce flex in this area on the axle by welding braces on the housing above the spline area to help. Also, the farther you brace out the better. I used two Moroso housing brace kits on my hotrod and the housing is rock solid.(they are cheap) I don't recomend that you road race that setup very long. Buy a cheap junkyard rear if you just have to race it, and live with the breakage. MUCH safer. P.S - A single track rear end takes less power to drive than locking rear ends.
cobrashock