rear end trouble at the drags

Do you know what carrier you have(center section)the last 3 numbers on the drivers side of the center section will be either 741,742 or 489 this will help identify wether it,s a clutch type or cone type sure-grip.They can both be rebuilt(new clutches for clutch type)and machining on the cone type.Your rear might be wearing down and causing limited slip(1 wheel spinning after launch)Just a thought..Can you give us a breakdown of your setup engine,trans,torque convertor and ages of each.:thumleft: