I have a 99 F150 4x4 with the 4.6 Motor approx 150000miles. Transmission went out so I decided to try and replace it...

New/rebuilt tranny went in with no problem but something is not right. It will drive but seems like it is stuck in high gear and bogs the motor down. It is giving me error codes P1747, P0750, P0755, P0743, P0102. All the wiring harness is in good shape with no burns or other noticeable problems. Somehow the transmission isn't reading right?

When I bought this rebuilt transmission I was told it was set up for 2wd but he would convert it for 4wd. The only difference i noticed with the new tranny is the shaft coming out of the tranny, where the safety neutral switch is, has a diamond shape instead of the oval shape that connects the shifter cable. No big deal i think, just had to buy a new link for the shifter cable with the diamond.

Also on the passenger side of the tranny there is a nine pin plug. My wire harness from the truck has one pin hole that is opposite of the tranny. Not sure why. Do I need a new harness or wrong tranny? Please help.

 

You have 2 issues.
Code 102 is the Mass Air meter. Is it plugged up?
The other codes are the internal trans solenoid operations.
EPC, solenoid A, solenoid B, and converter lockup.
You have a missmatch at the transmission plug.
This is why there are different plug shapes for different years and applications.
Also as a result, check for a blown fuse #23 to be sure it's still good.
Your trans. expert should know this.
What you need is the wire drawing for both the stock and the donor so a match can be made to the items above that are not working.
The PCM did it's job of telling you the circuits are in trouble from the plug missmatch.
It (PCM) looks at the current and voltage supply to these electrial items and sees opens and shorts where there should not be any.
This problem was easy, it's man made.
Good luck.