Clutch packs changed and shudder went away. Rear end pinion replaced took care of axle "howl". 4,000 mile later, rear end shudder back along with an axle whine we truck slows down! What now? Ford is really testing my loyalty with this one.

 

Take it back and tell them to fix it. Some have had the entire thing replaced by warranty. I'm getting my clutch pack replaced next week and I hope I have better luck than you.

 

I'm just noticing the shudder, and its relatively minor compared to what some of you are describing. As I posted earlier, I hope the dealer doesn't give me cr@p about oversize tires on stock wheels "contributing" to the problem.

I have no howl yet-makes me wonder if I should live with what I got now!!