TR690 CVT Clutch For Subaru 31441AA301 Transmission Gear Shaft Assembly Of The Reducer.

Function: Transmits torque from transmission output to differential while providing gear reduction for optimal wheel speed/torque.

Key Components:

• Hardened Gear Shaft: Case-hardened steel (HRC 58-62) with ground teeth for NVH reduction

• Tapered Bearings: Pre-loaded to withstand axial/radial forces

• Spline Interface: Precision-cut for zero backlash connection to differential

Failure Modes:

• Tooth Pitting: Fatigue wear from shock loads (causes whining noise)

• Bearing Spalling: Contaminated lubricant leads to premature failure

• Spline Wear: Results in driveline clunk (check rotational play <2°)

Critical Specs:

1. Gear backlash: 0.08-0.15mm (requires dial indicator measurement)

2. 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.