cuznguido

Make sure the air vent on that axle is not plugged up or dirt covered.

Sorry, old post.

Since it was just worked on, I would check the pinion nuts. Those things need to be TIGHT and the keeper between the nuts needs to be bent over to prevent it from backing off. You can do this without taking it out of the truck. I would also make sure that there is no debris down in the carrier from the previous issue. The mechanics should have washed it out good, but you can't count on that.