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Four- and six-cylinder Wrangler frames have different part numbers. Shown is an '87 YJ Wrangler chassis with a 2.5L four, the AX-5 transmission, a Dana 35 rear axle, and an NP207 transfer case. The 2.5L four was the base engine for YJs and TJs through 2002. The 2.4L DOHC four was the base engine in '03-'06 TJs.