Whether a transmission can be repaired without replacement depends on the extent of damage and repair costs. If the damage is minor, such as issues with the valve body or friction plates, repair is a more cost-effective option-especially for 4AT transmissions in older models, where many common faults can be resolved through professional repairs. During maintenance, special equipment must be used to perform dynamic transmission fluid replacement, ensuring a fluid exchange rate of over 90%, and the fluid level should be checked regularly (measured after preheating to 50°C). Manual transmissions have a relatively simple structure, allowing targeted replacement of damaged gears or bearings; automatic transmissions involve precision components like torque converters, making repairs more challenging. In routine maintenance, replacing the transmission fluid every two years or 40,000-60,000 kilometres is crucial-deteriorated fluid forms sludge that accelerates wear and impairs power transmission. It is best to have the work performed by professional repair facilities to avoid secondary damage from DIY attempts.
