I discovered a riding/rubbing condition between the driveshaft and a stamped steel hump within the tunnel.
Rubbing appears to be only superficial and no deep scratches or gouges exist at this time.
I do believe that this occurred when I carried 2 passengers in the rear seats (~170 lbs combined) a month ago. Until I resolve this issue, NO rear passengers!
As previously noted, I have the Steeda Ultralite lowering springs which lowered the vehicle approx. 1" at the rear.
As a precautionary measure, I relocated the e-brake cable bracket away from the center tunnel so there's no chance of the driveshaft to come in contact with the bolt head (on that bracket).
Relocation of this bracket can be accomplished without the removal of the driveshaft, although drilling the new hole can be quite challenging.
Stock location of e-brake cable support bracket
Metal band around the cable sheathing was crimped in place by the factory. Slightly open up the bracket with a flat blade screwdriver so the bracket can slip over the band. Can use pliers to close the opening gap if necessary.
Protective tape applied to cable sheathing to avoid any rub-thru condition. I used a metallic tape, but duct tape should work fine.
Mark and drill new hole.