Kaiser Jeep was sold to American Motors Corporation (AMC) in 1970, and the Buick engine was retired after the 1971 model year. (GM's Buick division repurchased the engine tooling in the early 1970s which served as the powerplant in several GM vehicles.) The "Trac-Lok" limited-slip differential replaced the "Powr-Lok" in 1971, and PTOs were no longer available after that year. AMC began marketing the Jeep less as a universal utility vehicle, and more as a sporty one, notably increasing its performance and features.