nagging brake/rear diff issue
Ok the story so far:
3 weeks ago after running some errands I noticed burning smell. I knew it was a stuck brake pad from the scent. Got the truck home and pulled into the driveway, noticed a nice oily smoke cloud drift past the pass. side windows. I got out and could really smell the cooked brakes. I did the old Nascar trick of feeling the rims to see how hot they were. Left rear was normal but the right rear was hot enough to fry an egg. I could hear the rotor pinging as the metal cooled. Called my mechanic and was told to bring it in. I let the rotor cool then use low pressure water from the garden hose to cool them of. The water was steaming off the rotor.
Took the truck in, turns out the sliders on the calipers were partly seized. They lubed them and caliper worked fine. No charge.
A few days later after only taking short trips I took a longer trip and when I parked the truck I again got the same burnt brake scent and the right rear rim was very hot again. No smoke this time. The truck has also had this annoying shudder at very slow speeds when making a tight turn. I figured it was low diff oil or it needed more friction modifier. So I took the truck back had them address the brake issue again and also to replace the rear diff fluid and check out the carrier/clutch packs to make sure they were all good.
Got the truck back Tuesday, all seemed good until I took a 45 min drive. Got home, same damn thing, the shudder was back and so was my overheating brake issue.
I'm at a loss as to what the issue is. They've checked the right rear brake caliper twice and the emergency brake and they say its fine. I checked the bill and it doesn't say if they put in friction modifier, just says gear oil.
There is also an intermittent squeal like when the brake pads get worn down, only time I can hear it is if the truck is coasting.
I have two theories.
1) The brake caliper is still sticking.
2) The rear diff is building up too much heat and that heat is being transferred down the axle to the right rear rotor.
Any advice/theories/comments would be helpful.
Whaddya mean I dont pay my bills?? Whydya think I'm broke!!
03 Lariat Crew 4x4 Line-x bedliner, Truxedo Lo-Pro QT Tonneau.
RIP [97 XL 4.2L V6]