What is the ford f150 transmission code u?

On the Ford F-150, transmission code "U" indicates A4R70W transmission, which is a high performance transmission and successor to the successful AODE. It haS4 forward speeds, rear wheel drive, A700lb-ft torque rating, and a wide gear ratio. Specifically, 1st gear is 2.84, 2nd is 1.55, 3rd is 1.1, and 4th is 0.70. This primarily appears on older models of the F-150, and it can be tempting to use older trucks as workhorses. It's particularly important not to overload the 4R70W, because there's a limit to what it can do. It's susceptible to overheating when under a high load, so You'll want to know Your limits and treat it with a healthy respect. If You treat it well, it will do the same for You in return.