"The 6T40 oil pump is a gear-driven, positive displacement pump critical for hydraulic pressure (maintaining 60-90 PSI in normal operation). Key features:

1. Design: Twin crescent-type gears with aluminum housing, driven directly by the torque converter.

2. Functions: Supplies pressurized fluid for clutch engagement, cooling, and valve body operation.

3. Failure Signs: Whining noise (especially when cold), delayed shifts, or pressure-related DTCs (e.g., P0841).

4. Weak Points: Common wear areas include the pump gears, pressure relief valve, and sealing rings.
   Pro Tip: Always inspect the converter hub and pump bushing during replacement – improper alignment causes rapid pump failure."**

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