of forced induction. Because of those problems, Isuzu North America changed to the larger 4ZE1 four-cylinder petrol unit for 1988 and used the standard 2.8-liter GM V6 for 1989 until their own new V6 engines could be manufactured. In 1987, the rectangular headlights were introduced, and LS trim was available for the five doors. For 1988, the 4ZD1 (2.3-liter) engine was upgraded to 110 hp, and introduced a 2.6-liter (4ZE1) I-TEC fuel-injected engine for the US market. In 1989, an optional General Motors 2.8-liter pushrod V6 borrowed from the Chevrolet S-10 pickup was also available. Later first-generation models offered an optional four-speed automatic transmission with the 4 cylinders getting a Aisin A340H and the V6s getting a GM 4L30E. Models from 1988 to 1991 were equipped with live rear axles and four-wheel disc brakes. Overseas model engines included the Isuzu C223 (2,238 cc), C223T (a turbocharged version of the same) and in the late 1980s naturally aspirated and turbocharged 2.8-liter 4JB1 diesel versions, all straight-four engines. The turbocharged 2.8-liter originally produced , not much more than the of the considerably smaller C223T due to new stricter emissions standards. Later versions with intercoolers fitted offered as much as . In 1989 only, a short-wheelbase (90-inch) Isuzu Trooper was imported to the US market as the Trooper RS. All of these short wheelbase Troopers were equipped with 2.6-liter fuel-injected inline-four engines, 4.77:1 differential gears and 15×7-inch aluminium alloy "snowflake" pattern wheels. Automatic and manual transmissions were offered. In Central America, Troopers were offered with removable roofs and a higher wheel clearance. Powertrain options included the Isuzu 2.8-liter turbo diesel. The Trooper was also sold in Australia and New Zealand as the Holden Jackaroo, named after the Australian term for a young man working on a sheep or cattle station. The standard Trooper was also sold under the Isuzu nameplate in New Zealand only. In Indonesia, where it was locally assembled by Garmak Motors, it was sold as the Chevrolet Trooper. Around 1987 a two-wheel-drive version called the Chevrolet Stallion was developed there; it has the Trooper's body on the chassis of a rear-wheel-drive Chevrolet LUV. It also has a rigid front axle instead of the Trooper's independent design. There was also a locally developed SUV model of the Isuzu Pickups built in the early 1980s called the Holden Lincah and Holden Raider. While similar to a Trooper in many ways it was