2005 chevy shortbed 4x4 - $6,000 (Plainview)

I am selling a 2005 Chevy shortbed 4x4 with 150,000 miles asking $6000 obo truck runs but when it gets 35 or 40 miles rpm’s rev up but once it shifts it drives good if interested call me at show contact info no calls after 10:00 pm and no emails