The U151F automatic transmission forward gear clutch drum input assembly is suitable for the Toyota Highlander transmission.
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Function: Transmits engine torque to the planetary gearset via engaged clutch plates (typically 1st-3rd/4th gears).
Key Components:
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Input Shaft: Hardened steel with precision-ground splines (connects to torque converter)
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Clutch Drum: Aluminum/steel hybrid with laser-welded piston channel
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Integrated Piston: High-pressure seals (Vitron or HNBR) for rapid apply
Failure Modes:
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Spline Wear: Causes clutch drag (delayed engagement, P0776 codes)
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Drum Warpage: Overheating distorts sealing surface (>0.1mm runout = replace)
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Seal Extrusion: Contaminated ATF degrades seals → pressure loss
Critical Checks:
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Measure shaft endplay (<0.3mm)
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Verify drum concentricity (dial indicator test)
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Inspect piston bore for scoring
Pro Tip: Pre-soak new clutch plates in ATF for 30 mins – dry plates cause initial shift flare.

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U151F Automatic Transmission Input assembly
,Toyota Highlander Automatic Transmission Input assembly
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