king nothing

What exactly does the shudder feel like? Mine feels like hitting rumble strips on takeoff and decel under about 10mph. Is this the same thing you guys are feeling? Mine isn't even bad enough to be annoying but I'm worried it will be worse when I hook up my travel trailer

cerhai

trailers make it straight up scary, it bothers me so much, down side of having a halfton with lots of torque made to drive like a car.

live2mac

Yes that's is correct. It's about 4-6 "speed bumps" and it's worse with a trailer. I emptied my truck yesterday and drove around for the afternoon with some errands no shudder. I noticed with my tools out of the bed the bottom leaf spring with the thin bumper doesn't touch the the middle leaf. With tools in it,the lower is touching. I try to recreate the shudder with out my tools but I couldn't. I'm convinced this could be the issue. Now whether it's changing the angle of drive shift and all the other variables is another question. It's going in this morning and I will see what they say. I will post back with finding and repairs. It will probably be fixes I do but maybe they will own up?

MAZZ MAN

if its a 6ft bed i have had this issue on a cust truck ended up putting a 5.4 raptor trans mount in it and it went away. the long driveshaft moves the rear of the trans on take off , took us a month to figure this out.

BucketMan

I suggest legal action against Ford. That's what I did!

RES4CUE

I know it's not exactly them fixing it but a lot of guys have fixed the issue with RAS.

http://www.activesuspension.com

It prevents the axles from wrapping and eliminates the shudder.

Not cheap but I have read tons of people are happy now that had your same problem.

BucketMan

I have it. It does not eliminate it, however it does reduce it. Adding any amount of weight to the truck, will bring it right back. I notice a difference even just with and without my 200# cap.

Not quite sure where you find tons of people. Only a handful of us that have it, none have had the issue resolved with it. Only definitive member that resolved it was dcfluid and he had custom springs built.

Strong work Ford!

RES4CUE

I just remembered the thread for the RAS, it seemed several were happy with the results.

Sucks it didn't get resolved.

F-250,LD

Mine is in the shop right now. They want it perfect before I get it back.
Mine may be different. I get a quiver in first gear, accelerating from a stop slowly, 1400-1600 RPMs, consistently.
They found the driveshaft carrier bearing bad, replaced it and it's better/not perfect. Then they tried shimming the axle, no change. Then they shimmed the transmission mount up by 2 washers (temp fix). They are waiting on a new trans mount, thinking that the original is bad. If that doesn't fix it, they might try a Raptor mount.

Mine doesn't change depending on load (light or heavy load or towing, no change).
Mine is NOT axle wrap. It is always at the 1400-1600 RPM range. Light acceleration, it's worse, heaver acceleration, not as bad because the engine goes thru that RPM range faster.

Killav-TT

My first 2011 SCREW 5.5' bed was buttery smooth right up until I took it in for the slip joint bump TSB. They lubed up the splines, put the boot on it, and when I got it back, it did this EXACT same thing when moving through this RPM band in first gear. There was no driving around it, it did it every single time. I took it right back and complained. They kept it over night, and when I got it back the next day, it was perfect again. Looking back, I really wish I could have talked to the service tech who did the work. All the ticket said was "re-aligned driveshaft".....

Now, fast forward to my 2013 SCREW with the same wheelbase, it will only shudder at a specific RPM in SECOND gear-about 1800 to 2000 with 3.55 gears. It is super smooth in first gear, no matter what throttle amount is applied. But when it shifts to second, and then I get on the throttle a little so that it doesn't short shift (so that it will go up to about 2k RPM's), it shudder's every time. Putting 5 people in it makes it much more noticeable. It is livable when I am by myself. I have mainly learned to drive around it. I can take off like a snail, or I can take off fairly briskly , both methods do the same thing, they avoid that specific RPM in second gear.

So last night, I went and bought these u-bolts and clamped them on.
http://www.oreillyauto.com/site/c/de...0970&ppt=C0361

Well, it honestly seems to have helped. It still not 100 percent gone, but I took three people to lunch today, so about 600 lbs of payload (I am a fairly rotund 250lb myself), and it was better. BUT, this is at the expense of a stiffer ride. It wasn't nearly as bad as when I tried the bump stops inbetween the bottom leaf and main spring pack. I think I might experiment and try and move it back a little closer towards the axle. Right now, it is clamped exactly 9.5 inches away from the center of the axle.

I plan on cutting the bolts down so that they do not rub on the E-brake cable. Also, I had to modify the U-bolts so that it would fit over the spring pack. They are just slightly to narrow, so I used my bench grinder and opened them up at the bottom of the U part so that they would not spread out the U to wide when I tapped them into place.