exclusively AMC powered. AMC years In early 1970, AMC acquired Kaiser Jeep Corporation and began refining and upgrading the range. American Motors improved manufacturing efficiency and lowered costs by incorporating shared components such as engines. Reducing noise, vibration, and harshness improved the Wagoneer driving experience. Visually, a big change was made during the 1970 model year, by replacing the metal grill with a new plastic grill with an egg crate pattern instead of vertical bars. The 1971 model year included a special "X-coded" model finished in "golden lime" with unique wood-grain side panels, numerous convenience features and power assists, that was priced $1,000 more than the deluxe "custom" model. After 1971, the outsourced Buick 350 was replaced by the AMC V8, and later the was made available. 1972–1983 The innovative Quadra-Trac full-time four-wheel-drive system, which broadened the appeal of Jeep products to people who wanted four-wheel-drive traction without the inconvenience of a manual-shift transfer case and manual locking hubs, was introduced in 1973. In 1974 AMC redesigned the greenhouse of the defunct two-door Wagoneer, with much wider D-pillars and single, long rear side-windows, and reintroduced it as the Cherokee. This replaced the Jeepster Commando, whose sales had not met expectations despite an extensive 1972 revamp. The Cherokee appealed to a younger market than the Wagoneer, which was regarded as a family SUV. Also in 1974, front disc brakes were introduced as standard equipment. While the new Cherokees still had 4-wheel drum brakes standard, front discs could be had as an option. From 1976 all Wagoneer and Cherokee models received strengthened frames with stronger cross-members and boxed side rail construction. After the introduction of the Cherokee, AMC began to move the Wagoneer upmarket, and that brought high demand from a new market segment. Midway through 1978 the "Limited" was introduced, more luxuriously equipped than the earlier Super Wagoneer, offering Quadra-Trac, power disk brakes, air conditioning, power-adjustable bucket seats, power door locks, power windows, tilt steering wheel, cruise control, leather upholstery, plush carpeting, AM/FM/CB radio, leather-wrapped steering wheel, roof rack, forged aluminum wheels, and "wood grain" trim on the body sides. The two-barrel, AMC V8 engine was standard with a four-barrel, available at extra cost. Even though the US$10,500 ($ in dollars ) suggested retail price was in luxury Cadillac and Lincoln territory, the Limited's high-level specification attracted buyers and sales were strong with a total of 28,871 Wagoneers produced in 1978,