my 2004 f150 transmisson wont change into drive

Hello, This may just be an issue with the transmission range sensor, but there are other issues that can cause this as well. Maybe the overdrive or torque converter clutch solenoid has failed. Look on the instrument cluster to see if it tells you that you are in drive when you select drive. If it reads that you are in drive while the transmission is allowing the vehicle to accelerate, the range sensor may be ok. I do recommend that you seek assistance on this, and most every transmission specialist will have seen this transmission hundreds of times.