American Motors purchased the Jeep division of Willys Motors in 1971. The CJ line, at that time, was made up of the CJ-5 and CJ-6. The engine line-up included the F4-134 Willys engine and V6-225 Buick engine.
In 1972, both of these engines were dropped and replaced by AMC 6-cylinder engines of 232 and 258 cid. The AMC 304 cid V8 was also offered.
In 1972 the wheelbase of the CJ-5 was lengthened from 81 in. (2,057mm) to 84 in. (2,134mm) to accommodate the larger American Motors engines. The CJ-6 also had its wheelbase elongated to 104 in. (2,642mm) to accommodate the larger American Motors engines.
For the 1976 model year the CJ-6 was discontinued in the U.S. and Canada, although still exported. A new model, the CJ-7, featuring an optional one piece removable plastic hardtop, automatic transmission, steel side doors with roll up windows and the full time 4WD system, Quadra-Trac® was introduced. The CJ-7 has a wheelbase of 93.5 in. (2,375mm).
In mid-year 1981 Jeep introduced its newest model, the Scrambler. Designed for rugged dependability and good fuel economy, the Scrambler is both a work and recreational vehicle. The standard engine is a GM built 151 cid 4-cylinder with an American Motors 6-258 an an option. A manual 4-speed transmission is standard with automatic as an option. The standard transfer case is the 2-speed Dana 300.
For 1984 the CJ-5 was discontinued. The 4-151 was replaced by an AMC 4-150.
In 1987, the CJ series was discontinued entirely, and Chrysler Corp., Jeep's new owners, introduced the Wrangler series. The Wrangler utilizes Dana axles, an AISIN or Peugeot 5-speed as standard equipment, the Chrysler 999 automatic and the 4-150 as the standard engine, with the 6-258 as the option.