a steel bed with a fiberglass top). Research and development work on the Trekker led to the development of the 4Runner/Hilux Surf, which was introduced in 1984. Toward the end of the SR5's production run (1983 model year), Toyota introduced the luxury Mojave trim for the US market as a limited-production (3,500 units) model with options not available on any other Toyota pickup. With a list price of , it had bucket seats, two-speaker multiplex radio, chrome front and rear bumpers, and deleted Toyota logos on either the grille or the tailgate. Cruise control, power steering, and air conditioning were optional. It was powered by the SR5's standard inline-four engine. In Thailand, this model was sold as the Toyota Hilux Super Star. Engines 1978–1983: 1.6 L (1,587 cc) 12R SOHC I4, at 5,200 rpm and of torque at 3,000 rpm (RN30/40, Japan) at 5,200 rpm 1981–1983: 1.8 L preflow, 4-speed manual (Australia), 1978–1983: 2.0 L (1,968 cc) 18R SOHC I4, at 5,000 rpm and of torque at 3,600 rpm (1983 European specifications) 1978–1980: 2.2 L (2,189 cc) 20R SOHC I4, at 4,800 rpm and of torque at 2,400 rpm 1981–1983: 2.4 L (2,366 cc) 22R SOHC I4, at 4,800 rpm and of torque at 2,800 rpm 1979–1983: 2.2 L diesel I4, at 4,200 rpm and of torque (SR5 long bed only in the US), LN30/40 Fourth generation (N50, N60, N70; 1983) The August 1983 redesign (sold as model year 1984 vehicles in North America) introduced the Xtracab extended cab option, with six inches of space behind the seat for in-cab storage. These models carried over the carbureted 22R engine while model year 1984 also saw the introduction of the fuel injected 22R-E engine. Two diesel engines were also offered, the 2L and the turbocharged 2L-T. The engines were discontinued in the U.S. after the 1986 model year, this was due to higher performance expectations from customers and the wide availability of inexpensive petrol. The next year saw the introduction of a turbocharged option, the 22R-TE, perhaps due to increasing competition from Nissan who already offered a V6 truck at this time. The solid front axle was replaced with an independent front suspension/torsion bar setup in the 4×4 model in 1986, and optional automatic differential disconnect for the front differential (an alternative to automatic locking hubs). 1985 was the last year of the solid front axle in most markets. The solid