A 5.0 Mustang LX Coupe with these miles would easily sell for twice the window sticker price. MSRP is not necessarily a good metric to go by on FMV....
So it sounds like the stock hydraulic setup on M5OD equipped trucks was either very hard to bleed and adjust properly, or else simply had issues with...
Always possible it was a hack - people have different standards for "good enough," especially depending on purpose (winning a derby vs. surviving on...