^^This.^^Are the inner and outer bearing cones tight against the spindle diameter?
Most drop spindles are for S10's & might use the different wheel bearings. I had the same issue w/the drop spindles I put on a 78 Malibu. Verify the wheel bearings fit properly on the spindle itself. If so, you'll have to get the correct S10 rotor (they are different).
Calipers & pads will still work.