2.9X posi IRS pumpking donor/halfshaft q?

[Gary Derian]

Right.  I meant to say ball splines.  Plain splines do lock up under torque.
Gary Derian <gderian at oh.verio.com>

>
> Splines tend to lock up under the high torques that half shafts can see.
> This effectively locks the suspension, although the effect of this varies
> depending on the design of the suspension and the amount of torque. A
> plunge joint is less likely to do this. Thats why the old Mopar Ball&
> Trunnion joint was used as an inner joint on half-shafts for Indy, etc. A
> tripod would be better, of course [assuming it has sufficient strength]