2005 Dodge Ram 2500

Body has a bit of rust but the frame is in decent shape. Rear passenger door not opening. Runs and drives but needs computer to shift correctly. Had new Towmaster Stage 1 Monster transmission installed with new TTVA but shifts hard and has engine light. Mechanic said computer needed. Injectors replaced less than 10,000 miles ago. B&W flip over fifth wheel. Decent Firestone Transforce tires. Newer headlights. Intact dash. Make an offer, need to pay bills.