Rear end vibration

[circle c]

Any body ever have any rear end vibrations on their F150? It only does it when I'm turning. Its like something is not releasing like it should.

[75K30]

Did not welcome you to the site, so welcome:

You bring a common question to the boards, and the answer is as simple as can be.
You F-150 is equiped with a limited slip rear differential, and you are feeling the clutches chattering. This can feel a little funny around corners, especially under a decent amount of acceleration.
This is telling you that either the rear diff is low on fluid, or that it is need of service. It could also tell you that it has been serviced, and there was simply not enough "friction modifier" installed, or maybe none at all.
After you can determine that the proper fluid and level is in the rear end, you simply add a bottle of friction modifier to the diff. This is available from your local ford dealership, and will fix that little chatter right up.
If your level is low, you will then have to figure out where the leak is, and fix that. Pinion seals often leak, but the vent can get plugged too, and pressure will build, thus pushing fluid out.
Find and repair any leaks.
No problems, just verify your fluid levels, and it is as easy as pie to add a little bottle. You will impress yourself with a job well done!
Good luck

[circle c]

Thanks a bunch! Makes sense!!!!

[circle c]

Well, we did that.... still making the noise... Plus, now it's making a ticking noise when I pull out.

And NOW, I had a spark plus blow out through the right side back cylinder...any ideas on getting this taken care ogf?

[75K30]

Is this "ticking" noise related to the spark plug problem, or is the noise coming from the rear axle? There is never a good rule of thumb for how much friction modifier to be used. It is entirely possible that your LS unit requires a little more.
I am assuming that to remove all of the fluid in the rear end, that the cover was removed, and a proper inspection performed. Was this the case, and what were the findings? Anything look real bad? How about metal shavings?
Your spark plug problem is a comon problem with Ford triton engines. In my opinion the tapper and the threads are incorrect, and the result is a cylinder that blows the plug clean out. A few times, and the threads usually come right out with it.
Some later heads have a troublesome "step" that makes repairs far more difficult.
I have used this kit ++ TIME-SERT FORD SPARK PLUG REPAIR, blown out spark plugs problems Frequently Asked Questions ++
for repair with limited success. I have yet to find a true fix for these problems, although I have found that makng the plugs real tight (way over factory recommended torque values) seem to help. This over-torque is used as a preventiative measure, and not a fix. This only works prior to any damage to the threads. Damages threads will not benifit from an over-torque. Once the threads are damaged, they seem to fail more and more often, until the threaded hole is no longer any good.

[tjzz4]

Ford is aware and there is a TSB for updated clutch packs. Here is the TSB from 04. But other years are invloved.

Printable View (51 KB) TSB
06-4-4

• LIMITED SLIP AXLE CHATTER, SHUDDER, BINDING SENSATION, OR VIBRATION DURING LOW SPEED TURNING MANEUVERS

Publication Date: February 13, 2006
FORD:
2002-2004 Mustang, Explorer
2003-2004 Expedition
2004 F-150LINCOLN:
2003 NavigatorMERCURY:
2002-2004 Mountaineer


This article supersedes TSB 06-02-16 to update the Service Procedure. ISSUE:

Some 2003-2004 Expedition, 2003 Navigator, 2004 F-150 vehicles equipped with a 9.75" or 8.8" limited slip rear axle, and 2002-2004 Explorer 4dr, Mountaineer, and Mustang vehicles equipped with 8.8" limited slip rear axle, may exhibit a chatter, shudder, a binding sensation, or a vibration during low speed turns. On 4X4 vehicles, the sensation may appear to be originating from the front axle or the steering gear.
ACTION:

First verify the condition. On 4X4 trucks ensure that the vehicle is in 2WD, to isolate the rear axle. On all vehicles, turn the wheel fully right (or fully left) and then accelerate the vehicle. If the condition is verified to be in the rear axle, replace the limited slip clutch pack.
SERVICE PROCEDURE



CAUTION:INSTRUCT THE CUSTOMER NOT TO TOW WITH THE VEHICLE FOR 500 MILES (805 KM) AFTER THIS REPAIR, TO ALLOW THE AXLE TO BREAK-IN PROPERLY.

Order and install the appropriate clutch pack, follow the instructions detailed in the Workshop Manual.

• 6L1Z-4947-A (9.75" limited slip)
• F5AZ-4947-BA (8.8" limited slip)

NOTE:INSTALLING A CLUTCH PACK INTO AN INDEPENDENT REAR SUSPENSION (IRS) AXLE IS DIFFERENT FROM INSTALLING A CLUTCH PACK INTO A SOLID-BEAM AXLE. BE SURE TO FOLLOW THE APPROPRIATE WORKSHOP MANUAL PROCEDURE.
INSTALLATION TIPS

• Be sure to install NEW circlips and halfshaft/wheel end nuts on IRS rear axle (not included in the service kit)
• Soak the new clutch packs in Additive Friction Modifier (XL-3) for fifteen (15) minutes prior to installation
• For IRS axles, the half shaft seals need to be replaced. Expedition and Explorer/Mountaineer applications should use seal kit part number 5L1Z-4A109-A. Removal of the half shaft excluder seal 1L2Z-1N013 may be required, if equipped, to facilitate re-assembly
• Refill axles with 4 oz. Additive Friction Modifier (XL-3) and the necessary amount of Rear Axle Lubricant (XY-75W140-QL), regardless of the axle lubricant system originally used in the axle. Fill to capacity recommended in the Workshop Manual

NOTE:AXLE FLUID REQUIREMENTS HAVE BEEN CHANGED. ALL VEHICLES BEING REPAIRED BY THIS TSB MUST HAVE REAR AXLE LUBE XY-75W140-QL INSTALLED, IN PLACE OF XY- 75W90-QFEHP. AS PART OF THIS REPAIR, CHECK AND REPLACE IF NECESSARY THE CURRENT XY-75W90-Q"FEHP" METAL TAG, WITH A NEW 75W140 TAG (F3TZ-4121-AA). ADDITIONALLY, REMOVE THE MULTI-COLORED LABEL WHICH IS LOCATED ON THE RIGHT SIDE AXLE TUBE, OR BLOCK OUT ANY/ALL "FEHP" OR "75W90" REFERENCES ON THE LABEL.

PART NUMBERPART NAME6L1Z-4947-A9.75" Axle Clutch KitF5AZ-4947-BA8.8" Axle Clutch Kit5L1Z-4A109-AAxle SealXY-75W140-QLRear Axle LubricantXL-3Additive Friction ModifierW710084-S439Nut (Wheel End)2L1Z-4B422-CACirclips (for 9.75")1L2Z-4B422-BACirclips (for 8.8")F3TZ-4121-AAMetal Tag - 75W140
WARRANTY STATUS:

Eligible Under Provisions Of New Vehicle Limited Warranty Coverage

[tjzz4]

Here is what they have to say about thread repair... On a warranty repair they replace the head but apparently ford does recommend this as a retail fix.

Printable View (47 KB) TSB
07-21-2

• 4.6L 2V, 5.4L 2V, OR 6.8L 2V - SPARK PLUG THREAD REPAIR PROCEDURE - NOT COVERED UNDER NEW VEHICLE LIMITED WARRANTY

Publication Date: October 17, 2007
FORD:
1997 Thunderbird
1997-2004 Mustang
1997-2008 Crown Victoria
1997-1999 F-250 Light Duty
1997-2004 Expedition
1997-2008 E-Series, F-150
1998-2004 F-53 Motorhome Chassis, F-Super Duty
2001-2005 Excursion
2002-2006 ExplorerLINCOLN:
1997-2007 Town Car
1998-1999 NavigatorMERCURY:
1997 Cougar
1997-2008 Grand Marquis
2002-2006 Mountaineer


This article supersedes TSB 07-15-2 to update the vehicle model years. ISSUE:

Some 1997-2008 vehicles equipped with a 4.6L 2V, 5.4L 2V, or 6.8L 2V engine and aluminum cylinder heads may experience a spark plug port with stripped or missing threads.
ACTION:

Follow the Service Procedure steps to correct the condition for non warrantable repairs.
SERVICE PROCEDURE



Ford Motor Company now authorizes LOCK-N-STITCH aluminum insert and tool kit as a proper repair procedure.
Follow the procedure included in the tool kit for using the tools and inserts. Tool kits and inserts can be ordered from Rotunda by calling 1-800-Rotunda (768-8632). Choose option two (2), part number 302-00001.
NOTE:FORD MOTOR COMPANY HAS DETERMINED THAT REPAIRS MADE WITH THESE ALUMINUM INSERTS AND LOCK-N-STITCH TOOLS DO NOT AFFECT THE HEAT TRANSFER FUNCTION BETWEEN THE SPARK PLUG AND THE CYLINDER HEAD.

NOTE:THIS PROCEDURE IS NOT AUTHORIZED AS A FORD WARRANTY REPAIR. FOR VEHICLES WITHIN WARRANTY, REPLACEMENT OF THE CYLINDER HEAD IS RECOMMENDED.

NOTE:THIS IS THE ONLY FORD AUTHORIZED PROCEDURE FOR SPARK PLUG THREAD REPAIRS.

NOTE:THIS PROCEDURE IS AUTHORIZED FOR ESP REPAIRS AND RETAIL REPAIRS.

WARRANTY STATUS:

Information Only - Not Warrantable