dgerhard1

I have done a lot of research on this topic and found some helpful hints on this site. My 2005 F-150, 5.4L truck was slipping in OD (or it appeared to be). Take it out of overdrive, worked fine. Went up and down gears fine. Problem was between 40-50ish MPH. Through my research, most common problem noted was a bad coil causing a misfire and making it seem the transmission was slipping or jerking in OD. Took it in with my research and sure enough, had a bad coil. Had the plugs changed while in there (original at 105,000 miles) as well as cleaning out the throttle body. Runs great...problem gone. So I wanted to pass this along for all the other people that experience this problem. Have your shop check the coils...first.

nbarnard

Did you have any CEL codes or was the CEL light on, indicating missfire detected? I am having similar issue with truck lurching/slipping, but NO CEL. Just changed tranny fluid, no fix. Truck is 06 with 170kms and has had new plugs done, but no coils.

Just wondering how to test for bad coils?

wpeter77

This us exactly what kind is doing. Its in od when it happens and feels like misfire. Right in the 40-50 mph range.