Sooooo I have a 2011 SCrew XLT Ecoboost 4x4 with a 6" rough country lift on 35" federal mud terrains.. My truck shakes very noticeably, at moderate speeds of 40+ it shakes slightly and quite a bit if the road is bumpy. Once I get to 70 mph+ on a freeway even on a well paved road it gets pretty ridiculously shaky I can feel it through the seat, steering wheel, pedals, floor boards the whole deal. It's really really starting to annoy the hell outta me... I tried reading up on it but nothing seemed to really help. Could it be the rough country lift? Could it be some components going bad... I'm really almost considering buying an entirely new system and going higher dollar on a BDS, I'd hate to think I wasted good money on the RCX but what else could there be to do???
Any advice would help.. I'm willing to try anything.

 

are your tires cupping?

 

Sounds to me like a tire balance issue. Also, the tires may "balance" but be out of round or have weak spots, bad belts inside, in that case nothing but different tires will help. Bent wheels can also cause that.

 

Back to the tire shop. Rebalance your wheels & tires. Also check your driveshaft angles.

 

I've had the issue before and they needed balancing and it fixed it for awhile, I guess I'll take it back and give it another once over to see what they say, just hope this wont be a reoccurring issue . Ill keep y'all posted of I need another round of ideas, thank you

 

What exactly does that mean?

 

Tire balance, driveshaft balance, wheel bearings, or brake rotors.

 

I was looking at a "complaint site" last night (I'll try to find it again). It seems to be (and has been) a common problem, getting worse with warmer temperatures. Best to see the dealer. I believe, there is a TSB on it.

 

are your after market hub centric? you may need the concentric rings to make them centered on your hubs. can buy them on ebay cheap, common problem when not running factory rims. tires cupping from rotating regular, with aggressive tires i found a 3k mile rotation works best. bad u joint can cause balance problems. i would start with rims first.

 

See: http://www.carcomplaints.com/Ford/F-...steering.shtml