I was thinking of buying a 2004 2.5rs as a project/fix up car. the motor is in good shape but the transmission, which is automatic, isn't the smoothest and the rear diff sounds rough. Issues aside its a family members car so I'll be getting it for next to nothing. My question is how hard would it be to swap in a manual transmission? I would like to turn the car into a weekend toy and I was thinking it wouldn't be a bad place to start, especially if the price is too good to turn down. Also has anyone repaired/replaced a rear diff? How involved would that be? Also any idea what kinda $ this would cost. I would shoot for used parts as much as possible.