To diagnose this a little further... and to be sure that it is something in the center section...
Jack it up, put it on stands, pull the wheels and tires... re-install the wheel nuts to bolt the rotors/drums to the axle. Have you/someone start it up an re-create the load that was producing the noise, while you/someone uses a stethoscope to pin-point the noise.
If its not in the brakes, pull the rotors/drums and do the same thing. If its in the third member... pull it out and look for anything obvious. If not... and you are not comfortable with doing the work yourself, I would recommend that you take it somewhere that specializes in differential service to pull it apart, fix it and re-assemble.
Seeing that you live in in Arizona... I would recommend that you use a straight weight 90 at the minimum... (I myself would use a straight weight 140.) If you can get Schaeffer's locally, I would use their #209A with the suspended moly... or if a multi-viscosity in being used (or you cant find the Schaeffer's, there are dealers in Mesa and Phoenix)... I would use Torco's 85-140 RGO (available all over Arizona.)
Do not use a synthetic... use a crude or paraffin based oil product and no, as stated... you do not need to use any friction modifier.
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