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Jeep CJ; Jeep Wagoneer/Grand Wagoneer; Kaiser Jeep was purchased by AMC in 1970. The Buick 350 cu in (5.7 L) V8, AMC 232 I6, and AMC 327, 360 V8 engines in the FSJ Wagoneer and trucks used a 'nailhead' pattern TH400—also known as a "unipattern," as it was used by many other manufacturers (including Rolls-Royce and Jaguar) with an adapter ring—from 1965 to 1972.
Transmissions used in later AMC vehicles came with either a 21-spline or a 23-spline output shaft. Transmissions coupled to four-cylinder engines typically used 21-spline output shafts. The 23-spline manual transmission was universal in the Eagle lines and was generally used with six-cylinder applications. All transfer cases were available with ...
The four-cylinder engine was installed in only 147 Eagles, but this still allowed AMC to advertise its fuel economy of 24 mpg ‑US (9.8 L/100 km; 29 mpg ‑imp) city and 30 mpg ‑US (7.8 L/100 km; 36 mpg ‑imp) highway with the four-speed transmission and 32 mpg ‑US (7.4 L/100 km; 38 mpg ‑imp) with the five-speed on the highway. [57]
The 4.0 L is one of AMC's best-known engines. [30] It was one of four AMC engines kept in production when Chrysler bought AMC in 1987. Chrysler engineers continued to refine the engine to reduce noise, vibration, and harshness. The last in the line of the AMC inline sixes, the 4.0 L is regarded as one of the best Chrysler 4x4 off-road engines. [31]
Engine choices consisted of AMC I6 or V8 powerplants. When it was equipped with the net 215 hp (160 kW; 218 PS) 401 cu in (6.6 L) AMC V8 engine, it would outrun other 4x4s in its class, and, with 3.07:1 highway gearing, could reach speeds in excess of 100 miles per hour (161 km/h) (early models had 120 mph speedometers).
The AMC and Kaiser engines do not share bellhousing bolt patterns. Cam trouble on the 230 was common due to inadequate oil formulations of the time. Its under-square bore and stroke endeared the engine for low-speed torque. It was a dependable engine with reports of them going 250,000 mi. with no major problems—with proper maintenance.
The AMC straight-4 engine is a 2.5 L straight-four engine developed by American Motors Corporation (AMC) that was used in a variety of AMC, Jeep, and Dodge vehicles from 1984 through 2002. The 2.5 L I4 Jeep engine shared design elements and some internal components with the AMC 4.0 L I6 that was introduced for the 1987 model year.
The engines purchased by AMC continued to use the Chevrolet V8 bellhousing pattern. The four-cylinder engine was discontinued from AMC's rear-wheel drive models after 1982. During 1983, the all-wheel drive Eagle base engine switched from the Iron Duke to a new, AMC-developed 150 cu in (2.5 L) four-cylinder. The 1980 through 1983 Jeep CJs were ...