here's the thing. I have recently put a lift on my truck, including some other performance mod's. So i decided to go and do a little off-roading. when i tried to do some of the steeper hill runs I heard some weird noises coming from the front end. It was like click-click-click-*****. It sounded almost like gears grinding and then finally engaging. I had the truck in 4 low and the gear selector was in drive and not in 1 or 2. It only happened when i was in the middle of a steep hill and the suspension was definitely bouncing around during the runs. If any of you know what this could have been, i would really appreciate some input. thanks guys!
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Defective IWE, vacuum leak in the tubing, defective solenoids or water in one or all three of the preceding parts. This is covered by TSB number 06-8-15 (publication date April 18, 2006).

Regards

Jean Marc Chartier

Thanks to Bonusbuilt1950 for the following:
Here's the TSB in case anyones interested

FORD: 2004-2006 F-150
LINCOLN: 2006 Mark LT


ISSUE:
Some 2004-2006 F-150 and 2006 Mark LT 4X4 vehicles built before 4/24/2006 may exhibit a noise in 2 wheel drive from the front Integrated Wheel Ends (IWE) and/or the 4X4 system being inoperative. The IWE solenoid may have ingested water and passed it to the IWE system causing water contamination in the vacuum portion of the system. A shorted IWE solenoid can set the codes C1979 and C1980. If either code is present, the 4WDH light will be inoperative.

ACTION:
Use the following Service Procedure to check and repair the 4X4 system.

SERVICE PROCEDURE

Replace the IWE solenoid. Torque the new design bracket and solenoid to 62 lb-in (7 N-m). It will be necessary to remove the vacuum lines from each IWE down at the wheels to check for water being present.
If no water is present at the vacuum line at the IWE, install the new solenoid with bracket. Reconnect all vacuum hoses.
If water is present allow it to drain from the vacuum lines. Then follow the updated procedure outlined in 2006 Workshop Manual (WSM) on-line version, Section 308-07A, Pin Point Tests B21 and B22. These tests checks IWE leak rates with vacuum and will remove any residual water from the IWE. Reconnect all vacuum hoses.
If the IWE looses vacuum quicker than specification. Refer to WSM, Section 204-01B for normal diagnostic procedures.

PART NUMBER PART NAME
6L3Z-9E441-A IWE Solenoid


WARRANTY STATUS:
Eligible Under Provisions Of New Vehicle Limited Warranty Coverage

OPERATION DESCRIPTION TIME
060815A 2004-2006 F-150 4X4 and 2006 Mark LT 4X4: Check Diagnostic Trouble Codes And Replace The IWE Solenoid (Includes Time To Check For Water At The Wheels) (Do Not Use With 12650D) 0.5 Hr.
MT060815 Claim Additional Labor Required As Actual Time Or Use SLTS Operation If Available Actual Time

DEALER CODING
BASIC PART NO. CONDITION CODE
9E441 42

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NOTE: The information in Technical Service Bulletins is intended for use by trained, professional technicians with the knowledge, tools, and equipment to do the job properly and safely. It informs these technicians of conditions that may occur on some vehicles, or provides information that could assist in proper vehicle service. The procedures should not be performed by "do-it-yourselfers". Do not assume that a condition described affects your car or truck. Contact a Ford, Lincoln, or Mercury dealership to determine whether the Bulletin applies to your vehicle. Warranty Policy and Extended Service Plan documentation determine Warranty and/or Extended Service Plan coverage unless stated otherwise in the TSB article. The information in this Technical Service Bulletin (TSB) was current at the time of printing. Ford Motor Company reserves the right to supercede this information with updates. The most recent information is available through Ford Motor Company's on-line technical resources.

Copyright © 2006 Ford Motor Company