Expo flutter

[BakerEdition]

When taking off from a stop on normal acceleration, I get a little wiggle in the whole truck, in fact my laptop will shake a bit...tires are new, its not in the engine...its consistent every time I take off, now under hard accel, I dont feel it...Its the weirdest thing.....any ideas??? just turned 91k

 

[rburch]

Could be TC shudder

 

[Thermo]

Baker, you have a limited slip rear end right? If so, check your fluid level and if it is slightly low, top off the fluid. With our trucks, if you loose even a little bit of fluid in an LS axle, it will give what you are seeing.

 

[BassinFever]

I have just a slight hint of that also, only if I take off easy! It's like just a little shudder!

 

[sgtowing]

I had the type of thing but it only happened when I turned. Took it to the dealer and they said change the fluid. There is some kind of special additive in the fluid for the LS units. I know mine is a 2nd gen but the mechanic said it is for all expy LS units.

 

[megawatt00]

The additive is a Friction Modifier, some of the synthetic gear fluids have it in them already. Ford part # Ford CM19546A1

 

[AlexExpy]

How to find if one has a LS or not. I have looked at the door sticker but can make head or tail.

Mine is an 05 EB BTW.

 

[BakerEdition]

Baker, you have a limited slip rear end right? If so, check your fluid level and if it is slightly low, top off the fluid. With our trucks, if you loose even a little bit of fluid in an LS axle, it will give what you are seeing.

Thermo, Yes I do have a limited slip...I had front and rear both changed about 8k ago and added the additive for the limited slip...I will check them this week as I am putting in a new A/C compressor and clutch...mine is leaking a bit behind the clutch and its getting noisy.... don't want it to explode and go through the A/C system...Big bucks then!!!

I have had a U-joint give me this flutter feeling before but usually when they are loose...no signs of that...could it work just the opposite if it were seizing up?...they originals at 91k