Deni, that sounds normal to me. I've plenty of experience with Salisbury's and they generate a lot of noise when you run them in the air. The wheel that is snatching is a brake rubbing, and if you want to test that, just back off the adjuster on that side. The reason you get the noise is that every time it snathches, the diff 'reverses' so you get a backlash knock each way. It really is nothing to worry about if its quiet on the road.
(also grounded at present)..........
