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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.
