Re: 2004 JGC Limited 4.7 Quattro - noise in rear axle
Welcome to the garage.
Is the amount of friction modifier in the fluid as specified by jeep? You could try a bit more of additive and then make several as tight as possible figure 8's, so that the fluid and additive gets well into the vari loc.
Also change the T-case fluid and the front diff, as they are probably old as well. Sometimes the T-case can cause noises equal as with the diff. The NV247 T-case, used in quadra drive jeeps, uses special mopar fluid, which is Mobil 424.