Originally Posted by
JustAddDirt
It has to do with the direction of force (downward pressure) applied to tire when the pinion gear tries to climb the ring gear. Torque
On a 9" rear, or any conventional style axle, there is more pressure applied to the LR wheel on acceleration.
Which is why on an open rear end, you punch the throttle to accelerate in a straight line, the RR wheel spins, even though motor torque tries to twist chassis and plant RR, it still unloads the RR tire.
that is why a lot of drag racers add their battery to the right rear corner of their vehicle.
On a qc, the pinion is on the back side of the axle, and on the opposite side of ring gear, so the torque applied when pinion tries to climb the ring gear more pressure is applied to the RR wheel.
It has nothing to do with lockers, or spools.
It has to do with torque, and the directional forces in which items react when power, or rotation is applied.
That is why you have to add a bit of wedge to compensate, typically I add about 25lbs on a 4 link car.
Just my opinion.