Function: Generates hydraulic pressure (85-120 psi) for clutch engagement, lubrication, and valve body operation via torque converter drive.

Key Features:

• Gerotor Design: High-precision inner/outer rotor set (OEM 68163845AA) with hardened steel construction.

• Critical Specs: Rotor-to-housing clearance <0.08mm; relief valve opens at 130±5 psi.

Failure Modes:

• Rotor Scoring: Contaminated ATF+4 fluid (metal debris → P0841/P0868 codes).

• Seal Degradation: Causes pressure loss (delayed shifts, especially 2-3 upshift).

• Cavitation Damage: Aerated fluid from clogged filter (whining noise at idle).

Pro Tip: Prime pump with ATF+4 before installation – dry starts cause instant rotor galling.