yes it will fit, but you need to get a crossmember from a 95 and it will go in there.
Should drop right in...same engine.
No , the 1999 Ford Mustang came with the ( 3.8 liter V6 engine ) or if it was a GT version it came with a 4.6 liter V8 engine Helpfull
The 1999 Ford Mustang 3.8 liter engine was rated at 190-horsepower
The 3.8 litre V6 engine in a 1999 Ford Mustang has a timing CHAIN
The 1999 Ford mustang was rated at 190 horsepower for the 3.8 liter engine and 260 horsepower for the 4.6 liter engine
The 1990 Ford Mustang 5.0 liter V8 engine is rated at ( 225 horsepower from the factory )
( 5W-30 ) according to the 1999 Ford Mustang Owner Guide
It will bolt in, however, you will run into problems with the onboard computer. You will have to reprogram, or maybe even change it.
Five quarts with filter
The Ford Mustang GT has a V8 engine, while the Ford Mustang has a V6 engine.
The 1999 Ford Mustang 3.8 liter V6 engine takes : ( 5 quarts with engine oil filter change )
My ( 1991 ) Ford Mustang 5.0 LX came from the factory with ( 5W-30 )