EBinMT

Maybe because you have the 5.0 with less low end torque, 3.55 gears, most who experience it have the 6.5' bed, manufacturing variances,... Who the hell knows exactly why some do or some don't. But it has been found that some experiencing this shudder have cured it with mods that eliminate axle wrap or by dealers installing new springs. Some have luck with shimming, while others have found that shimming will help when loaded, but worsen when unloaded or vice versa.

dcfluid

You got your head stuck in the sand.
Come up for air.
Ford has videoed on their own dyno the axle wrap issue, and has issued TSB to address it.
The TSB works to varying degrees for owners because it is a patch for poorly engineered springs in the 6.5 screw.
Ecoboost low end torque magnifies the problem. Even the 6.2 can't match low end torque of the Ecoboost.
Soft, nice riding half ton springs with the torque usually seen in a HD diesel leads to weak areas in design.
My shudder was BAD! Traction bars installed were a 100% fix.
RAS is a 90% fix.
There is no longer any doubt with so many sources coming to the same conclusion, even the manufacturer.

Cord

Thanks to the children who ruined yet another constructive thread. Gotta love this forum!

jonbar87

Maybe I'm misunderstanding, but when I hear the word "shudder", I think vibration. There is no way a small amount of axle wrap is going to cause vibration. That is the whole point of the u-joint. Unless it's EXTREME axle wrap like this, the u joint is going to compensate for the different change in angles, hence "universal joint". Now obviously if it's as bad as in that video, it will cause some major vibrations and most likely break the u joint.

jonbar87

Fixed it for you

PRNDL

Well said.

PRNDL

Well said.

jonbar87

I would be inclined to think it's a transmission problem. Axle wrap would be THE last thing I'd consider as the problem.

EricTheOracle

There are only five things that can cause our shuddering problem:

1) A dragging or locked brake.
2) Pinion angle is set wrong.
3) Axel wrap.
4) Bad U-joint or sticking drive shaft.
5) Transmission gear slip.

Consider the facts

1) The leaf springs on the 157" WB Ford are longer than the 145" WB truck and more prone to axel wrap.

2) The problem is more acute as payloads increase.

3) Lubing the driveshaft didn't effect the shudder.

4) A Ford field engineer acknowledged that the shudder is axel wrap.

5) The shudder goes away with Roadmaster Active Suspension or with floating traction bars.



That said, why are you arguing the take off shudder with those of us who have had the problem and systematically puzzled through the solution?

justjimmy

I've been quiet about this and have been amused.

Simple, RAS resolved my take off shudder when loaded. Read what Eric wrote.

Jeesh.