4L65E Mechanical Oil Pump Assembly 1998 - 2003 300mm
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Typical Faults:
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Crescent Wear
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Symptom: Low line pressure (P0756/P0776 codes, delayed shifts)
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Cause: Abrasives score pump face (especially after torque converter failure)
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Drive Gear Spline Stripping
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Symptom: No movement in any gear (metal debris in pan)
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Cause: Torque converter hub wear transfers to pump
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Pressure Regulator Sticking
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Symptom: Erratic shifts or harsh engagements
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Trigger: Varnish buildup from degraded Dexron III
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Critical Measurements:
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Rotor Clearance: >0.15mm requires replacement
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Prime Test: Should hold 50+ psi for 10+ seconds
Pro Tip: Always replace pump and TC together – 85% of pump failures originate from converter debris.

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4L65E mechanical oil pump assembly
,300mm Mechanical Oil Pump Assembly
,Mechanical Oil Pump Assembly
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