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The Jeep Wrangler YJ is the first generation of Jeep Wrangler four-wheel drive small off-road vehicles, rebadging and succeeding Jeep's CJ series, which was produced from 1944 to 1986. The first Wrangler (internally "YJ") was launched in 1986 and ran through 1995.
Engine bay of a 1993 Jeep Grand Cherokee with 4.0 L The 5 millionth Jeep 4.0 engine produced on the "Greenlee Block Line" dated June 15, 2001 The 242 cu in (4.0 L) engine was developed by AMC [ when? ] in just 26 months using many off-the-shelf components while featuring, among others, additional strength, improved combustion chamber, port ...
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 Jeep Wrangler (YJ) did not get the AMC 4.0 L I6 engine until 1991, when Chrysler-designed electronics accompanied it. Until then, it retained the AMC 258 cu in (4.2 L) engine with a carburetor. No other Jeep vehicle was equipped with Renix electronic controls.
The AW4 is also used behind the 2.5 L (150 CID) AMC Straight-4 engine. It has a removable bell housing with a mount for the crankshaft position sensor. Early AW4s used 21-spline output shafts. In 1991 the AW4 was changed to a 23-spline output shaft, concurrent with adoption of the High Output (commonly known as H.O.) inline six-cylinder engine.
The Jeep version is labelled "NV(NP)241J." This is not the NV241OR transfer case found in the Jeep Wrangler Rubicon, which uses a 4.0 low range and has a reinforced case. Dodge uses a 241DHD, which has a reinforced case but the 2.72 low range. The Jeep Grand Cherokee/Commander line no longer offers a part-time transfer case option.