Cord

They don't specifically mention the LS, but I believe you are correct. Ironically, I don't have a LS! Thankfully, these guys are not doctors or they would have scheduled me for a pre-natal exam.

justjimmy

This talks about 4WD models. I have a 2WD with the shudder since new.

I'm frustrated that Ford won't recognize the issue with 2WD models.

Ford850

I guess what I am asking is... how did your dealer rebuild your differntial using that TSB if yours is an E-locker? In the TSB they said they performed, it says:
"OPERATION DESCRIPTION TIME
111106A 2010-2011 F-150 Equipped With 9.75 Rear Axle: Replace Rear Axle Limied-Slip Clutch Packs Following The Service Procedure (Do Not Use With Any Other Labor Operation) 2.5 Hrs."

EricTheOracle

For the record, a shudder around corners is easy to diagnose and I wouldn't even concern myself with that type of shudder since I know I have a limited slip diff and once the clutch packs wear in a bit, it'll likely go away on its own.

What the majority of us have is a shudder in a straight line on take off and in high torque applications like when pulling or carrying a heavy load. Given that we have one positive report of floating traction bars helping the shudder, we can be reasonably certain that our top leaf is too long* and is allowing the axil to wind up, a phenomenon we experience as a shudder. Alternatively, our traction control may be tapping the breaks and causing the same phenomenon but I doubt it, given the speed and available traction at which it happens in my truck.

On top of that there is yet another shudder people are experiencing that apparently has more to do with the engine management system that is taking place at 50-55mph-ish. I've felt this shudder only twice: once while in 6th gear, empty while chugging up a long low hill in the cold, and once while giving my truck the beans to pass after the truck shifted from (what I think was) 4th gear to fifth gear.

* I'm told that 157" WB trucks have a longer rear leaf than the shorter 145" WB trucks.

tm7554

So nobody makes tractions bars for a 2009-2011 F150? I also have the shudder on acceleration. I would think the traction bar would surely resolved this.

EricTheOracle

On Monday, I'm contacting a vender that manufactures everything in house to consider making their forward-mounted full-floating, traction bar as a regular product for our trucks.

02reaper

iTrader: (2)

Calvert Racing will make some. They made a set for my 2011 f150 a few weeks ago. Been running them for a couple of weeks now.

dcfluid

I'm very worried about any traction bar that doesn't compensate for the growing spring length as it compresses. Trailer towing will distort the springs and sack them out plus screw up ride quality if the bars aren't done right.

Cord

The traction bar I built for my 2500 allowed for the length change. At some point I compressed the suspension so far that I permanently bent my springs. Makes sense since the bar forces the axle to swing in an arc. Just remember that if you use a traction bar on a truck that it can never be used to haul

dcfluid

Read back and see my traction bar story and pictures. It will work with a load when set right. This spring will see my version 2.0