I have a 2010 F150 Platinum, 5.4 liter, 4x4, supercrew, 51/2 foot bed, one piece drive shaft. The problem is I have a slight rumble feeling, I believe more so at lower speeds while in 2H. While feeling the rumble if I shift into 4H or 4L the rumble goes away. Any ideas what the problem may be? Thanks in advance.

 

IWE's not fully disengaging. Plenty of information about how to diagnose and replace available on this site as well as others.