8-3/4 Axle adjustment

On the 8-3/4 rear, the right axle has an adjustor spline. how much play should be in it? When I make right turns and the car shifts into second I get a grinding sound in my rear and sometimes it will slip like it's spinning the tire. Oh, its a 2.94 open rear, and it didn't do it in the last car it had this gear set in, which makes me think it has to do with that axle.
Thanks!