Massey Ferguson released the 399 tractor in 1987 and it became the most powerful of all the 300 Series tractors they released. It was powered by a 97 horsepower engine at the outset and throughout its development was increased to 104 hp and finally 125/130 hp from 1994 to 1996. Massey Ferguson stopped producing the 399 in 1997 at a time when the tractor was selling for $37,800. After they launched the 4200 Series, the 399 was replaced by the 4270.