I have a 2004 f150 lariat 4x4 5.4l.. I have been having issues with the 4x4. On several instances I've put it in 4Hi when Rollin slow as it goes into 4wd. But if I put it in reverse is doesn't spin the front wheels and it makes a horrid grinding noise. Here's another thing though. Now when I put it In 4wd If pops up on the dash "transmission malfunction" I'm stumped any help would be appreciated.

 

sounds like your shift motor on your transfer case is acting up...

 

would that cause the thrown code and tranny malfunction alert?

 

not sure... but the T-case is connected to the tranny