I took my 04 screw Fx4 in for a rear vibration problem yesturday,
and here is what I got.
A vibration damper that is put on the rear of the frame.
Its about 10"x10" square and seems about 25 pounds, it has a big round piece of rubber in the middle attached to a spring, this does the actual dampening.
One1 big problem it goes were my hitch is and the hitch cannot go back on the truck. because its an aftermarket hitch i need to take it off so the damper can be installed. the mechanic doesnt know if it will work with a factory hitch, but will find out and i will post it.
Just thought Id let all you know who have the vibe problem.

M

 

Mine was built 04/04 and they are supposed to have a factory dampener and don't need that... Earlier build dates tried that but that part did nothing!!!

 

that vibration dampner was a band-aid that Ford threw on any truck that vibrated. I think now they are trying to dig a little deeper with drive shafts, driveshaft angles, ring and pinion, road force balance the tires, ect...

 

I had the dampner installed by my dealer. They had to take the hitch off to install it, but then put the factory hitch back on after.

 

Mornargo..... I hope you've seen this TSB. Sort of covers all the vibration issues.
My dealer started at the top and when they got to replacing the driveshaft, the vib was gone.

Originally posted by 02RegularCab4x4
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Hers's a little info some of you might find helpful in getting your truck fixed
TSB # 04-3-3
ISSUE:
Some 2004 F-150 vehicles may exhibit a vibration at highway speeds. The vibrations will typically be felt through the seat and/or floorpan.

ACTION:
The purpose of this TSB is to simplify the process for diagnosing vehicle vibration and avoid unnecessary repairs. Refer to (Figure 1) and select the symptom and speed that matches the customer description of the condition and perform only those diagnostics steps.

NOTE: BEFORE BEGINNING THIS PROCEDURE, ENSURE THAT THE TIRES DO NOT HAVE FLAT SPOTS. IT MAY BE NECESSARY TO DRIVE THE VEHICLE FOR UP TO 30 MILES TO ELIMINATE THIS CONDITION. IF THE VEHICLE'S CONDITION IS CORRECTED AFTER DRIVING, THEN RETURN THE VEHICLE TO THE CUSTOMER. NO FURTHER DIAGNOSTICS ARE REQUIRED.



NOTE: WHEN EVALUATING THE CONDITION IT IS RECOMMENDED THAT THE VEHICLE BE OPERATED ON A FLAT SMOOTH-SURFACED ROAD THAT HAS MINIMAL OR PREFERABLY NO EXPANSION JOINTS, SUCH AS ASPHALT. ROUGH ROAD SURFACES MAY MASK THE CONDITION OR GIVE A FALSE FEELING OF VIBRATION.



SERVICE PROCEDURE (Refer To Figure 1)
FIRST ORDER TIRE/WHEEL DIAGNOSTIC PROCEDURE 10-12 HZ, 88-105 KM/H (55-65 MPH)
NOTE: FOR 4X2 VEHICLES GO DIRECTLY TO STEP 2.



Check the integrated wheel end (IWE) on 4X4 units. Raise the front of the vehicle (wheels off the ground), engine running, vehicle in 2WD mode. The front half shafts should not turn when wheels are rotated by hand. If the IWE is functioning correctly proceed to Step 2. If not, refer to the Workshop Manual Section 308-07 to repair IWE first. Then proceed to Step 2.
If road force measurement equipment (Hunter GSP9700/9712, or equivalent) is available, proceed to Step 3. If not, mark the original tire/wheel location on each tire. (i.e. LF, LR, RF, RR) and remove from the vehicle. Check wheel balance, and rebalance as required to achieve less than 0.25 oz. (7g) of imbalance. Reinstall wheels and road test vehicle. If the condition is corrected return the vehicle to the customer. If not, proceed to Step 5.
If road force measurement equipment is available (Hunter GSP9700/9712, or equivalent), measure the tire road force variation on all four (4) tires, following the manufacturer's instructions and TSB 03-20-8. If any wheel assembly measures more than the values listed below for R1H or R2H then proceed to Step 4. If not proceed to Step 5.
Tire Types:

P Metric Tires, (R1H 26 lbs.) (R2H 18 lbs.)
LT Tires, (R1H 39 lbs.) (R2H 27 lbs.)
Using the tire road force measurement machine, determine the low spot of the wheel run out. Match high point force variation on the tire with the low spot of wheel run out. Re-test the wheel assembly force variation. If the wheel assembly is now acceptable, rebalance and road test vehicle. If the condition is corrected return the vehicle to the customer. If not, replace the tire and re-check, then rebalance and road test vehicle. If the condition is corrected return the vehicle to the customer. If not, proceed to Step 5.
Condition is due to vehicle sensitivity. Obtain Damper Kit 4L3Z-5D008-AA and refer to the instruction sheet included in the kit for installation.
NOTE: THE DAMPER KIT WILL NOT HELP STEERING WHEEL NIBBLE CONDITIONS.



FIRST ORDER DRIVELINE VIBRATION DIAGNOSTIC PROCEDURE 30-40 HZ, 64-97 KM/H (40-60 MPH)
Drive Vehicle at speed where 1st Order Driveline Vibration is most pronounced, typically 64-97 km/h (40-60 MPH).
Once peak vehicle vibration is reached place transmission into neutral.
If the vibration remains with transmission in neutral, the source is most likely the driveshaft. Replace the driveshaft and re-evaluate.
If the vibration is eliminated, the source of vibration is either transmission or rear axle related. Proceed to Step 3.
NOTE: IF POSSIBLE, PERFORM STEPS 3 & 4 WHILE GOING UP A SLIGHT GRADE TO INCREASE LOAD ON ENGINE.



Achieve peak vehicle vibration and set vehicle Speed Control.
Unlock transmission torque converter by hitting overdrive cancel button.
If vibration remains with transmission torque converter unlocked, source of vibration is most likely the rear axle. Replace rear axle and re-evaluate.
If the vibration is eliminated, the source of the vibration is most likely transmission related. Refer to the Workshop Manual Section 307-01, Diagnosis By Symptom, Other Concerns: Noise/Vibration in Forward or Reverse for continued diagnosis. Repair as required and re-evaluate.

PART NUMBER PART NAME
4L3Z-5D008-AA Damper Kit

Shudder TSB # 04-1-6
ISSUE:
Some 1998-2004 F-150 4X4 vehicles with a one piece drive shaft may exhibit a clunking or grunting noise and/or a shudder sensation from the driveline. The condition will typically occur during light to moderate acceleration from a stop and/or braking. This may be caused by the slip yoke not sliding smoothly on the transfer case output shaft splines.

ACTION:
To service, lubricate the slip yoke with Teflon Grease (D2AZ-19590-A). Refer to the following Service Procedure.

SERVICE PROCEDURE
Road test the vehicle to verify the condition.
Remove the driveshaft per Section 205-01 of the Workshop Manual.
NOTE: INDEX (MARK) THE DRIVESHAFT YOKE TO AXLE FLANGE FOR REASSEMBLY.



Lubricate the slip yoke with 7-13 grams (0.25-0.46 oz.) of Teflon Grease (D2AZ-19590-A).
Re-index and reinstall the driveshaft per Workshop Manual.
Check the transfer case fluid level and add MERCON Automatic Transmission Fluid XT-2-QDX if necessary.
Road test to verify the condition is corrected.

PART NUMBER PART NAME
D2AZ-19590-A Teflon Grease

 

Thanks Everyone I apreciate all the helpfull info.
M