Hello,

I bought a 2005 expedition 5.4l automatic with a 4R75W
The truck goes into reverse no problem no slip, but forward it slips really hard have to rev up and then it will engage, It only engages after od light starts flashing. Once engaged it will drive until you let off throttle, does not climb inclines very well. then code P0720 OSS open circuit comes up and check electronic throttle comes up, replaced OSS sensor, and ran a new wire for the oss signal to ecu the blue wire with yellow stripe, truck does same thing, fluid level is good, fluid color is pink. Does it need a new trans or should I be looking at something else wrong?

Thanks