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.