The 3.8 liter (over head valve / pushrod design V6 ) has a cast iron block , if
that's what you are asking ?
Your clutch is operated by a cable , it's not a hydraulic operated clutch on the 2000 Ford Mustang
According to the 2000 Ford Mustang Owner Guide : For the 3.8 and 4.6 With engine oil filter change : ( 4.7 litres / 5.0 U.S. quarts of 5W-30 )
A 2000 Ford Mustang GT has the 4.6 litre Single Over Head Cam , V8 engine from the factory ( 281 cubic inches ) If you look at the 8th " character " of the VIN : " W " means the engine in your 2000 Ford Mustang GT was made in Romeo , Michigan , USA " X " means the engine in your 2000 Ford Mustang GT was made in Windsor , Ontario , Canada
The 2013 Ford Mustang has a 6-speed manual.
The 2012 Ford Mustang has a 6-speed manual.
The 2005 Ford Mustang has a 5-speed manual.
The 2006 Ford Mustang has a 5-speed manual.
The 2011 Ford Mustang has a 6-speed manual.
The 2003 Ford Mustang has a 5-speed manual.
The 2007 Ford Mustang has a 5-speed manual.
The 2010 Ford Mustang has a 5-speed manual.
The 2001 Ford Mustang has a 5-speed manual.