I have never had a problem getting rid of rear end noise, as long as you don't wait forever to fix it after first hearing the noise.......you dump the fluid, add new fluid, drive the vehicle clockwise in a lot for 10 minutes, then 10 minutes CCW.....drop the fluid, and replace......fixes it every time......but you can't drive it with the noise for any length of time and then expect this procedure to fix it.....