wont shift into 3rd or 4 gear
 

I have a 2006 f150 king ranch with the 5.4L, 108,000 miles

I did replace the sparkplugs because it started to misfire now the motor runs great but then it wont shift into 3rd or 4th gear so then i replaced the throttle position sensor and shift solenoid nothing has changed, I did the 2nd gear motor brake test and that works just fine I have had 2 places try to pull the trouble codes but there is no codes I have ran out of ideads and there is not much info on this issue anywhere I would be thankful for any help at this mess

Thanks
Kevin

I hope somebody has an answer, because the same thing happened to me yesterday! I had a fuel pump go bad, replaced them all along with the fuel filter, now I don't have anything higher than 2nd.

I'll let you know when I find the solution, hope you do the same.

What does the fluid smell and look like?

My fluid looks and smells normal.

What does it do when it goes to shift into 3rd? Act like its in neutral?

Mine does.

sounds like a clutch pack no longer holds. aka rebuild time.

In case any one else finds this thread -
Mine failed one day after working fine - no 3rd and neutral at 20mph
I took it apart and figured out the Direct Drive drum had all the teeth stripped off - where it slides onto the output shaft teeth.
The Direct Drive drum and clutch pack enable 3rd gear, need 3rd gear to get the OD function.

I got confidence to take it apart from you Tube videos by Transmission Bench
www.youtube.com/watch?v=pDIAnmnpGK4