6R80 CVT Automatic Transmission Direct Gear "B" Clutch Drum Assembly
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Typical Faults:
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Spline Stripping
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Symptom: Slippage in direct gear (P0733/P0776 codes)
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Cause: Hardened steel splines wearing against aluminum drum
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Piston Bore Scoring
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Symptom: Delayed 3-4 upshift
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Trigger: Contaminated ATF acting as abrasive
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Drum Cracking
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Symptom: Sudden loss of drive (metal debris in pan)
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Root Cause: Thermal fatigue near lubrication ports
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Critical Checks:
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Spline Engagement: Should have <0.1mm rotational play
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Bore Diameter: Measure at 3 points (taper >0.03mm fails)
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Drum Runout: >0.05mm requires replacement
Pro Tip: Use assembly lurbe on splines during rebuild – dry starts accelerate wear
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6R80 CVT Automatic Transmission
,CVT Automatic Transmission Assembly
,Automatic Transmission Assembly
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