I do have a 65 axle 3.00 gearing, i did pull it apart, had some interesting in the 3rd member but they found one local. Are you looking for one complete with brake hardware or just the housing, 3rd member and axles?
Unfortunately im located in Southern Tx, so not so close.

Rich
 

I HAVE A COMPLETE REAR AXLE ASSEMBLY I TOOK OUT OF MY 65 FASTBACK.  IT HAS BRAKE ASSEMBLES AND CABLES FOR EMER. BRAKE. THE AXLE CODE ON THE DOOR SHOWS "F". WHICH SHOWS IT TO BE A 2.80:1 AND LIMITED SLIP.  I CAN'T SPEAK TO THAT'S WHAT IT IS AS I WAS NEVER INSIDE IT.  I DROVE IT FOR A WHILE BEFORE CHANGED EVERTHING TO A 9 INCH LINCOLN VERSAILLE ASSY.  IT DIDN'T HAVE ANY PROBLEMS BEFORE I CHANGED IT OUT.  IT DOES NEED A NEW PINION SEAL.  IT DOESN'T LEAK ALL THAT BAD, BUT IT DOES DRIP AFTER SITTING A WHILE.  I AM LOCATED SOUTH OF SPRINGFIELD, MO.  I WOULD SELL IT FOR $350 IF YOU"RE INTERESTED.  THANKS