Reverse Gear Drum Clutch Of The 4R75 Gearbox With A Low-position One-way Clutch For Ford
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Typical Faults:
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One-Way Clutch Roller Jamming
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Symptom: Harsh 1-2 upshift or delayed reverse engagement (P0730/P0756 codes)
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Cause: Contaminated fluid or sprag spring fatigue
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Drum Spline Wear
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Symptom: Reverse slippage or metallic noise
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Trigger: Hard shifts causing torsional stress
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Thrust Washer Failure
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Symptom: Axial play >0.25mm (whining in reverse)
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Root Cause: Improper assembly torque
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Critical Checks:
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Sprag Clutch Test: Should lock counterclockwise only
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Drum Runout: <0.08mm tolerance
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Fluid: MERCON V only – others degrade OWC lubrication
Pro Tip: Replace entire drum assembly if splines show polishing – indicates mutual wear with planetary gears.

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reverse gear drum clutch 4R75
,Low position one-way clutch
,Reverse gear drum clutch
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