Doesn't say if it's the 3.0 or 4.0. If it's rust free and a 4.0 I'd pay around 4500 for it. 6500 is way too much. If it's the 3.0 I would pass.

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2003 v6 4.0 4x4 xlt extended cab
manual transmission 135000 miles
29x12x16 tires bilstein 5100 shocks