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 )
Look at the gear stick, if its auto then you have an auto transmission, if its manual you have a manual transmission.
Mercon V
Type F
Cruise-O-Matic
Type F Automatic Transmission Fluid.
nissan matic d for auto trans and 75w90 for manual trans