International Harvester 1066

1066 Tractor

• DT-414 engine.
• Turbocharged six-cylinder direct start diesel engine.
• Hydrostatic power steering.
• Dry[2] disc brakes.
• Hydraulic assist clutch
• Dual pto's (540/1000).
• Non synchronized 4 speed transmission with a non synchronized 2 speed range transmission, 16 total forward speeds when equipped with Torque Amplifier.
• Dual hydraulics.
• Engine HP 105 it has been a myth that some tractors came off the floor with over 150 hp, which was not uncommon. The 414 is sometimes known as a factory hot rod, built and engineered by Jerry Lagod who later formed Hypermax Engineering and set the milestone for the ultimate super stock diesel engine

When introduced in 1971 two cabs were available, the "Custom" cab carried over from the previous series and the "Deluxe" cab. Both cabs could be equipped with air conditioning, heat and AM radio.

In 1975 after the introduction of the 30 series John Deere, IH decided rather than replacing the 66 series they would give the line a "tune-up" starting with increase of about five horsepower, also IH altered the "Deluxe" cab, it now had just one window on the doors instead of two, the rear window now opened farther and the lower rear window was enlarged. The cab was now painted all red with the roof still being white. Also in 1973 the "custom" cab was dropped along with the optional Hydrostatic transmission version.