The Maximizer 4x4 Transmissions bring performance to your four-wheel drive. A four-wheel drive application is especially tough on an automatic transmission and the addition of bigger tires makes the job even harder. The Maximizer series is designed to be as tough as your truck because each transmission is built with the best components available and programmed to provide crisp shifts time and time again for applications ranging from 450 to 550 HP. Part Number 411701 works with 1966-1991 big block Ford C6 equipped 4WD vehicles. Has 5" Spacer between transmission and transfer case.