I believe that is a 4R70W
According to the 2001 Ford Mustang Owner Guide , the 5 speed manual transmission that is used with the 3.8 liter V6 engine takes ( Motorcraft MERCON automatic transmission fluid )
Motorcraft MERCON automatic transmission fluid is used for the power steering fluid in a 2001 Ford Mustang according to the Owner Guide
The 2001 Ford Mustang has overhead valves (OHV).
If it's a Sport Shift (auto), then you use Honda's auto transmission fluid. If it's a manual, Honda's manual transmission fluid. Use no other fluid in your Honda.
The recommended automatic transmission fluid for the 2005-2007 Mustang is Mercon V automatic transmission fluid
5W-20 ( according to the 2001 Ford Mustang Owner Guide )
For a 1964 Ford Mustang, the recommended transmission fluid is typically Type F automatic transmission fluid. If the Mustang has a manual transmission, it usually requires a specific gear oil, such as 80W-90. It's essential to check the owner's manual or consult a vintage Ford expert for the exact specifications based on the transmission type.
Look at the gear stick, if its auto then you have an auto transmission, if its manual you have a manual transmission.
Cruise-O-Matic
Mercon V
Type F
Type F Automatic Transmission Fluid.