OKay so i converted my truck from auto (4r70w) to 5 speed (99 F1 V6 Ext Cab 2wd) everythings good except my speedometer says i am going 100 when im going 45 tried a new OSS still same thing so i ordered a ECM from a 99 f150 v6 5 speed. Put it in and now im not getting fuel and i dont hear my pump prime. I stuck my old one back on and starts right up.. Is it something with the ECM is it something i could fix any ideas guys oh and if it means anything my codes on my ecm are AAT2 on my auto and GTL4 is the one i ordered thanks for the help..

 

Like I said in your other thread, it has to be flashed. You need to find a dealer that can work with it.

 

Only place I found that can do it is a Dino shop they want 195 an hr and I have to buy a 350 dollar tuner before they will even touch it