U760E U760F Automatic Transmission Rear Planetary Gearset Sun Gear Assembly
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Function: Central torque distributor in Toyota/Lexus 6-speed FWD planetary gearset, enabling 5th/6th gear ratios.
Key Features:
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Material: Case-hardened alloy steel (HRC 58-62) with ground helical teeth
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Spline Design: Micro-polished internal splines for reduced wear against input shaft
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Thrust Control: Integrated washer surface (critical for axial play adjustment)
Failure Modes:
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Spline Stripping: Causes gear spin (sudden 5-6 shift flare, P2716 codes)
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Tooth Pitting: Fatigue from high-mileage overdrive use (whining noise)
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Bearing Surface Wear: Alters planetary alignment (>0.15mm wear = replace)
Critical Specs:
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Sun gear axial play: 0.10-0.25mm (requires selective thrust washers)
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Backlash with pinions: 0.07-0.13mm
Pro Tip: Always replace sun gear and planetary carrier as matched set – mismatched wear patterns cause premature failure.
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Automatic Transmission Rear Planetary Gearset
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