What Causes Transmission Whining?

[AdamAnn]

Reasons for transmission whining: Excessive meshing clearance in the transmission. When the meshing clearance is too large, the driving gear impacts the driven gear during rotation, producing a knocking sound. This noise typically worsens as the transmission temperature rises. Gear noise can also result from damaged gear tooth surfaces, which creates an uneven sound. The louder the throttle, the more pronounced the noise becomes, and in severe cases, vibration in the transmission may be felt. Below is relevant information about transmission fluid: 1. Inspection method: The method for checking automatic transmission fluid differs from engine oil. Engine oil is checked when the engine is cold, whereas transmission fluid should be preheated to approximately 50°C before inspection. 2. Replacement interval: Automatic transmission fluid replacement follows a specific cycle. Due to the extremely precise internal control mechanisms and small fitting clearances in automatic transmissions, most manufacturers recommend changing the transmission fluid every two years or 40,000 to 60,000 kilometers.