2011 f150 crew 4x4 rear shudder
 

my truck shakes between 56 and 62mph. dealer tried balancing and rotating. Then they tried all new tires and it still shakes. I can see the box shaking in my mirror and feel it in my seat. Anyone else have this problem?

Funny... I just posted the same thing with my FX2, although I have aftermarket wheels and tires. It just started happening within the last 500 miles for me.:unsure:

Find my thread titled 55mph vibration. I updated what i went through with ford. I have a scab fx4 same problem. Box shaking vibration in seat 55 to 62 mph.. Ford went through numerous tests balance and road force. Different driveshaft and wheels and tires. Checked all pinion angles. Notified engineers on the issue. No luck... I would only be convinced if i test drove two trucks exactly like mine with the fx4 and same wheel base. Surely and surprising enough. Another 5.0 did it even worse and a ecoboost did it about the same as mine. Alot of the new trucks are apparently having this issue. Some arnt? Sorry to tell you bud but i went through it and am forced to live with it. Surely ford knows the issue and will have a tsb out in the next year or so. In the mean time welcome to the issue

Also to add on. I loaded up a 700lb can am atv into the bed. Drove and still shook. It seems to be more prominately shaking on the driver side. Let me know what you think. Ive decided to keep my truck looking past the issue hoping for a fix but we as the owners need to asure that ford is working on it. I will be calling and emailing and hopefully can get them to look on the forums looking at these threads as proof. Post your progress and what you think

Think I'm just going to drop it off at Ford and tell them to not call me until it is fixed.

Thats what i said but shudder or not i was sick of the rental dodge after 2 days. Let me know your progress. Im hearing this was even a issue in 09. Just this body style truck i suppose. Ford better find a fix.