4x4 Grinding Noise? Front Hubs Not Engaging?
This OE Replacement IWE Vacuum Control Solenoid is designed to replace factory part number 6L3Z-9E441-A and restore proper 4WD operation on 2004–2008 Ford F-150 4x4 and 2006–2008 Lincoln Mark LT trucks.
The IWE (Integrated Wheel End) system uses engine vacuum to control the front locking hubs. When the solenoid fails, vacuum loss can cause:
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Grinding noise from the front wheels while driving
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Partial hub engagement
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4WD not engaging properly
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Clicking or ratcheting from front axle area
Replacing the faulty solenoid is one of the most common and cost-effective fixes for these issues.
Product Features
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OE Replacement – Direct Fit
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Designed to replace OEM # 6L3Z-9E441-A
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Also replaces 4L3Z-9E441-AA and 6L3Z-9E441-AA
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Controls vacuum supply to IWE front hubs
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Restores proper 4x4 engagement
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Includes mounting bracket (if applicable)
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Plug-and-play installation
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Meets or exceeds factory specifications
Vehicle Fitment
Ford
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2004 Ford F-150 4x4
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2005 Ford F-150 4x4
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2006 Ford F-150 4x4
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2007 Ford F-150 4x4
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2008 Ford F-150 4x4
Lincoln
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2006 Lincoln Mark LT 4x4
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2007 Lincoln Mark LT 4x4
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2008 Lincoln Mark LT 4x4
Why Replace the IWE Solenoid?
The factory design is known for vacuum leaks and internal failure over time. A faulty solenoid allows unwanted vacuum release, which can partially engage the locking hubs — leading to grinding and premature hub damage.
Replacing it early can prevent:
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IWE actuator failure
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Hub assembly damage
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Costly front-end repairs
Cross Reference Numbers
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6L3Z-9E441-A
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6L3Z9E441A
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4L3Z-9E441-AA
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6L3Z-9E441-AA
