Hey fellas so I’ve got a 99 2WD f150 Auto which i wanted to convert to a manual. I’ve been looking all over the place on different sites and forums seeing how to do this but have not gotten any direct answers. I know that ford didn’t make the manual option for my model so obviously there would be some alterations. I also came upon that the 4.6L trans couldn’t take the 5.4L. I know it’s possible because I’ve seen it done but i just can’t seem to get any direct answers from one idea to the other. I saw some speculation as far as using an f250 5.4 manual trans but I’m still hesitant. If anybody could shed some light on this I’d be more than great full.

-Ulises

 

You would be much better off using a F250 transmission, but you will either have to cut a huge hole in the floor or install a 3" body lift. Either way, it has to be a 2wd transmission and you may need a custom driveshaft. You will have computer issues, the PCM expects to see an automatic.

 

As you read the 5 speed behind the 4.6 is not rated to take the torque of a 5.4. Of course you can install one. But towing will be limited a well as how much lead footing you can do without destroying the trans.

 

Could i just swap the computers?

 

I don't think you can run a F150 with a F250 computer. You would have to get some custom reprogramming done.