Transmission Oil Pan Inspection
Debris in the base of the oil pan can be an indicator of what's going on inside of the transmission. There are different types of debris commonly found in transmission oil pans.
Brass shavings: If gold colored flakes are found in the bottom of the oil pan suspect worn thrust washers and bushings. These parts are often made of brass and wear as mileage accumulates.
Metal shavings: If metal colored shavings are found in the bottom of the pan suspect chipped or worn gearset teeth. This can also be caused by worn parts like washers, bushings, and springs used to assemble the transmission. Sometimes a piece of casting or slag can be found upon the first inspection of a new transmission.
Black pieces: If pieces of black debris are found in the bottom of the pan suspect worn clutch and band friction material. It's normal to find fine particles, especially around the magnet. It's job is to attract metal particles circulating in the transmission fluid.