4R100 Automatic Transmission Oil Pump RF-F81P-7B324-AA
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Typical Faults:
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Rotor/Gear Wear
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Symptom: Low line pressure (P0841/P0868 codes, delayed shifts)
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Cause: Contaminated ATF or metal debris scoring surfaces
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Seal Failure
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Symptom: Pressure loss at idle (pump whine)
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Trigger: Hardened/rolled seals from heat/age
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Cavitation Damage
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Symptom: Foamy ATF, erratic shifts
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Root Cause: Clogged filter or aerated fluid
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Critical Checks:
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Clearance: Rotor-to-housing >0.15mm = replace
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Prime Test: Should generate 20+ psi instantly at crank
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Debris Inspection: Metal flakes indicate imminent failure
Pro Tip: Always replace pump and torque converter simultaneously – 70% of pump failures originate from TC debris.

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F81P-7B324-AA Transmission Oil Pump
,Automatic Transmission Oil Pump
,4R100 Transmission Oil Pump
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