Hello all, so, before you tell me to search for an answer, ive searched EVERYWHERE. I have a 2004 f150, 5.4l 4x4. I have no first gear, and this is what happened. I was driving down the road, and I noticed at stops my first gear would slip. This happened out of nowhere, no slips before this ever. Then around 25-30 mph it would disengage out of gear and I would have to come to a complete stop to get it to engage again. Within a time period of 45 minutes, it went from perfectly fine to the truck wont even go into first gear anymore.

I got the DTC codes, P0720 and the code for limp mode. It says the Output shaft speed sensor circuit is bad, so I did the diagnosis on the wires. Both wires have continuity, and are connected to the sensor. So I test the sensor, its in normal operating range, (420 ohms). So I bought a new OSS sensor, put it on, hoping that would fix it. NOPE! didnt do anything. So I drop the pan, put a new shift solenoid in, check for any metal fragments, and there are barely any at all. Ive seen more in a perfectly good tranny. So, now I have this truck that doesnt go anywhere, and the DTC code I think isnt even related to my problem. Im about to just drive this thing into the lake and never buy a ford again. Has anyone resolved this issue before? any help would be great.

Also, I forgot to mention, reverse works fine. I just cant get it to engage at all in drive. I jacked it up so the rear wheels were off the ground, and it seems like 2-4 work and catch just fine. But on the ground the truck refuses to get into gear.

 

Transmission

 

That happened to me, same thing

 

Let's try this again.

Thread cleaned. Title changed.

 

That's some serious cleaning LOL and I like it. I have solved transmission problems by adding fluid, cleaning filter and changing fluid. I've never taken one apart, but I have swapped for a salvaged one.

 

Mine did the same thing but over the course of 3-4 weeks. Tranny went out.