Toyota introduced its compact 4-wheel-drive sport-utility vehicle in May 1984, based on the same running gear used in their compact pickup truck. The lineup included a 2-seat base 4Runner and 5-seat Deluxe and SR5. Base engine was a 116-horsepower 2.4-liter 4-cylinder. Optional was a 150-horsepower 3.0-liter V6. A 5-speed manual gearbox was standard, with 4-speed automatic optional. Rear antilock braking went into V6 models in '90. However, the ABS only works when the vehicle is in 2WD mode. Each 4Runner featured a built-in roll bar and removable roof until 1991. All models had on-demand 4WD except for a rear-drive 4-door model that was available only with the 4-speed automatic transmission.