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It looks like you can go all the way up to a SCab XLT 4x4 with a 6.5' box with the 3.7L V6 - Only with a 3.73 non-limited slip axle. Looks like that carries up from the XL and STX too, with 4x4. Once you select the SuperCrew cab it automatically changes the engine to the 5.0L. You can get the 3.7L in the SCrew, but only in 4x2 config.