If a howling sound occurs when shifting into gear, the tone of which changes as you increase or decrease «gas», the cause of this phenomenon may be a worn toothed connection of the corresponding pair of gears.
Noises in all gears are caused by the main gear or gearbox shaft bearings.
A rattle that occurs only after the gearbox reaches operating temperature indicates the beating of the synchronizer blocking rings. As soon as the oil becomes more fluid, it breaks off the synchronizer ring all the time in the same area.
Hint: workshops, as a rule, rarely decide to repair or overhaul the gearbox, but advise replacing the faulty gearbox with a new one. Financially, however, in most cases it makes more sense to install a used unit purchased from a car dealership. In this case, you need to pay attention to the correct lettering of the gearbox. It is embossed on the gearbox at the top front left (those. on the clutch housing). In addition, the day, month and year of manufacture are indicated there, and the year is indicated only by its last digit.
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