Can someone identify what motor is in this truck, the owners isn't sure, and neither am I. Thanks.

Does it say 2.3?

http://sfbay.craigslist.org/pen/cto/4894675936.html

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2004 4.0 4x4 5spd xlt with 175k 4.10 axles, extended cab, cranked t-bars (not maxed), painted black interior, 32x11.5x15 bfg a/t and procomp steel rims
60/40 mod with a shorty console