1. Oil seeps 

5. Strange noise
1. Bearing rattles, with the close relationship between speed, the higher the speed the more screaming.
2. Differential or main drive gear rattling, this rattling generally occurs at speeds of 50-70 kilometers is more obvious, because the gear mesh surface is different, generally in the refueling time rattling obvious, open the throttle rattling obviously weakened.
3. oil pump and other hydraulic system rattles, this rattling with the speed of the close relationship with the speed of the car has no relationship with the speed of the high speed because the oil pump oil suction is blocked, thus causing the screaming. It should be noted that the transmission system with the engine, chassis and other parts of the work together, a lot of sound mixed together, identification is not easy.
6. High oil temperature and odor
Transmission body is relying on hydraulic oil to work, when the oil temperature is too high, will produce some combustion, odor, indicating that the transmission body of some of the executive components are not working properly, need to test.
7. Jumping gears or not upshifting
General automatic transmission has a specific shift speed and speed, if you find that the shift time is suddenly too long or too short, it means that the transmission ratio is disproportionate, at the same time will feel that the engine speed is too high, the situation is even worse is that the transmission does not shift, which need to check the transmission.

8. Transmission slipping, engine idling, no speed up
Including smooth driving has been revving high, speeding up the process of revving high two cases -
1, smooth process of high speed, relatively easy to test, compared to an engine displacement of 2.0 vehicles usually in 2600 rpm can speed to 100 kilometers, if a period of time often need to 3000 rpm or more to reach 100 kilometers, generally due to the transmission of high-speed gear failure or knob within the locking clutch failure caused by the need to immediately overhaul the gearbox.
2, speed up the process of high speed, this fault test is a little complicated, because in the speed up process, the engine speed rise with the accelerator pedal has a close correlation, let's say a normal Passat in the case of small throttle engine speed to 2500 rpm can be accelerated up to the vehicle, but in the full-throttle engine will be raised to 5500-6000 rpm, such a huge contrast is due to the transmission failure or the internal locking clutch failure. Such a huge contrast is due to the fuzzy logic of the electronic control system of the transmission to control
9. Transmission slipping, engine idling
There are also two cases of engine idling--
1. The transmission suddenly drops from a high gear to a low gear in a short period of time, causing the vehicle to suddenly idle, the problem may be in the control system or cooling system, the transmission itself is not a problem.
2. In the process of accelerating or shifting gears in a short period of slippage idling, the problem is mostly in the gearbox clutch and other related links, to the gearbox to carry out a thorough dismantling overhaul.