Transmission Abnormal Noise Issues?

[MacJuliette]

When abnormal noises occur in the transmission, there are mainly the following reasons: 1. Bearing wear and damage: When bearings wear, their clearance increases and the fitting accuracy decreases; when bearings are damaged, abnormal noises may occur due to the inability to operate normally, and may even cause damage to transmission components, leading to further faults. 2. Loose bolts on the transmission housing, or excessive clearance between the gearshift lever and the shift fork groove in manual transmissions: Vibrations during use can loosen bolts, so regular inspections are necessary. 3. Long-term lack of automatic transmission fluid replacement: The fluid may thicken and lose its fluidity, resulting in insufficient lubrication between components, leading to direct friction and increased mechanical wear, which causes abnormal noises. 4. Use of inferior automatic transmission fluid: Inferior transmission fluid has poor heat resistance and is prone to oxidation, forming sludge and deposits that can clog filters and oil passages, increasing internal friction and causing abnormal noises in the vehicle.