Long time ago when mine got noisy I did slow figure 8s (to work the lude into the clutches) in the parking lot after I put the additive in. Worked for me.

This was on a One ton chevy with a Dana.

Allen Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first. Life was a little easier when I was just a wrench.