I have a 2004 f150 4x4. Lately it has a jerking problem when accelerating around 40 and 50 mph. Seems more often when driving up an incline. I feel it may be the transmission but not for sure. Any suggestions?

 

Check the transmission fluid to see if it's low. If it's fine, you may want to have the transmission flushed and do a total new fluid refill on it, with a new filter.

I just had this done to my 97 Grand Cherokee because it was hanging up between 1st and 2nd gear.

We used a big bucket to empty the old tranny oil into via the return line, and not a machine. My Jeep shifts awesome now.

If there's some debris floating around in the old oil and can hang up the valvebody.

 

I hate to say it but you're on borrowed time my friend. I had the same problem with my 04 and it was the tranny going. I noticed the problem, monitored it for a couple of days and noticed it getting worse. Made an appointment at the shop and ended up stranded on the side of the road on my way there the next day. These transmissions are not very good at all in these 04-08 F150s.

 

Hope it's not what buck says. Maybe try what Tony suggest first. My '97 would act the same way when it needed a tranny fluid flush.

 

Unfortunately these transmissions are really finicky. I feel a tranny flush will likely exacerbate the problem. But its worth a shot. Just be prepared for the worst. IMO the tranny is the weakest link on these 04-08 F150s.

 

Moved to 04'-08' Section.

 

Assuming fluid level is correct, personally, I'd add a can of transtune, put at least 100 miles (more is better) on it & then service it as Tony mentioned.

If you have a laser thermal reader (They are not expensive/ Harbor Freight is fine), take you truck for a drive & when the symptom presents itself, take a reading off your transmission cooler return line or Pan. If your seeing a reading i nexcess of 195F, your cooling coil is likely restricted. Transtune will take care of that. If you do a fluid change w/o Transtune treatment first, your new fluid will still be competing w/ the restricted coil & your Transmission will still be functioning at an elevated temperature.