just done new tie rods,rear bearing inner & outer. Now I have a grinding noise coming from rear end. Did new rear brakes,rotors,calipers and pads. Still got noise...must be differiential. I also notice that control arm bushing on passenger side need replacing and thinking that bushing may be part of problem. As always I welcome all suggestions. 94 Xj6. what is the stock gear ratio and can I improve prefromance by replacing different gears? Thanks!