TR690 CVT Clutch For Subaru 31441AA301 Transmission Gear Shaft Assembly Of The Reducer.
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Function: Transmits torque from transmission output to differential while providing gear reduction for optimal wheel speed/torque.
Key Components:
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Hardened Gear Shaft: Case-hardened steel (HRC 58-62) with ground teeth for NVH reduction
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Tapered Bearings: Pre-loaded to withstand axial/radial forces
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Spline Interface: Precision-cut for zero backlash connection to differential
Failure Modes:
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Tooth Pitting: Fatigue wear from shock loads (causes whining noise)
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Bearing Spalling: Contaminated lubricant leads to premature failure
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Spline Wear: Results in driveline clunk (check rotational play <2°)
Critical Specs:
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Gear backlash: 0.08-0.15mm (requires dial indicator measurement)
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Bearing pre-load: 0.05-0.10mm shim adjustment typically needed
Pro Tip: Always replace companion flange nut with OEM torque-to-yield spec – reused nuts cause pre-load loss.


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31441AA301 shaft assembly
,shaft assembly CVT clutch
,CVT clutch shaft assembly
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