Reply to "Gear oil level and change- New owner"

Your '86-87 Pantera #9425 may have the so-called 'Super-ZF. The factory ZF tags don't reflect it but if the diff case has a large curved flat piece on top that looks like added reinforcement (but is factory-cast), its an M-1 transaxle. ZF designed it as an upgrade for the turbo's torque in the early '80s for the BMW M-1s. That car had a far shorter production run than anticipated so some late Panteras got that box instead of an early assembly, who's rights etc had already been sold to Roy Butfoy in CA.

The diff-case is different due to the visible reinforcement, the gears are bigger and stronger and the mainshaft is larger with bigger bearings. As I understand it, the M-1 diff case can be swapped for an early case and transmission ass'y, but none of the transmission internals will swap to an early transmission case without machining. May have a different R & P ratio & tranny gear ratios, too. And being different, it may hold more lube. The 'Super-ZF' is quite popular with racers due to the overall heavier-duty parts.

Or maybe you just got lucky in draining it!