45RFE 545RFE Automatic Transmission Mechanical Oil Pump For 2012 Jeep Grand Cherokee

• • • Function: Generates hydraulic pressure (90-150 psi) for clutch/band operation and lubrication in Jeep/Dodge RWD applications.

      Key Features:

      • Gear Type: Crescent pump design with cast aluminum housing (OEM 05015851AB).

      • Critical Specs: 0.05-0.10mm gear-to-housing clearance; relief valve calibrated to 160 psi.

      Failure Modes:

      • Crescent Wear: Abrasives score pump face (low pressure → P1762/P2769 codes).

      • Seal Hardening: ATF+4 breakdown causes internal leaks (slow 3-4 shifts).

      • Drive Gear Spline Stripping: Torque converter hub wear transfers to pump.

      Pro Tip: Replace both pump and TC if metal debris is present – 545RFE’s dual-stage relief valve is contamination-sensitive.

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