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Transmission Oil Pan
The transmission oil pan is a metal cover (or metal sump) located at the bottom of the automatic or manual gearbox. Its functions are:
- To keep the transmission fluid inside the gearbox and prevent leaks.
- To collect debris and particles at the bottom of the transmission (sometimes it contains a magnet to attract metal shavings caused by friction).
- To hold the transmission filter in place in some vehicles.
📌 When removing the transmission oil pan, it is usually:
- Transmission fluid is replaced.
- The pan and magnet are cleaned.
- The pan gasket is replaced to prevent leakage.
Symptoms of a Damaged or Leaking Transmission Pan
- Transmission fluid leaking under the car
- You may notice red or brown fluid spots under the car, especially after parking for a while.
- Low transmission fluid level
- This appears when checking the transmission dipstick. Low fluid may affect transmission performance.
- Difficulty or delay in shifting gears
- Because low fluid reduces the hydraulic pressure inside the transmission.
- Grinding or clicking noises
- Caused by insufficient lubrication inside the transmission.
- Vibration or jerking while driving
- Due to low fluid or air entering the system.
Causes of Transmission Pan Damage or Leakage
- Cracks or dents in the pan
- Often from hits by rocks or high speed bumps.
- Damaged pan gasket (seal)
- Over time, the gasket may crack or shrink, causing leaks.
- Loose or broken pan bolts
- May happen after servicing or due to prolonged vibration.
- Damaged or incorrectly installed transmission filter
- Causes irregular pressure and increased fluid leakage.
- Corrosion or rust on the pan
- Especially in humid areas or areas with high salt exposure.
