4R70W 4R75E CVT Transmission Forward Clutch Drum With Solid Shaft
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Typical Faults:
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Spline Wear at Shaft-Drum Interface
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Symptom: Delayed forward engagement (P0776 codes)
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Cause: Micro-movement from torque reversals
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Drum Warpage
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Symptom: Harsh 1-2 shifts or clutch drag
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Trigger: Overheating (>300°F) distorts sealing surface
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Piston Seal Extrusion
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Symptom: Pressure loss in forward gears only
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Root Cause: Contaminated ATF degrading seal material
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Critical Measurements:
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Shaft Runout: >0.05mm requires replacement
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Drum-to-Piston Clearance: 0.10-0.15mm (use feeler gauge)
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Seal Groove Wear: >0.2mm depth = rebuild
Pro Tip: Always replace shaft and drum as matched set – mismatched splines accelerate wear.

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4R70W Forward clutch drum
,Solid Shaft Forward clutch drum
,Forward clutch drum 4R75E
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