A pit that must be avoided when buying a car gearbox.

There are often many experts who say that a car, engine and gearbox can be bought without problems. I think the electrical system is the same for today's cars. After all, the current car configurations are dazzling, and there are many complaints about the electrical system. As for the chassis suspension, the limit of it is rarely tested by ordinary people's working conditions. Independent suspension and non-independent suspension really don't feel much difference for a 654.38+million car. The most important thing is the engine and gearbox. After all, they are the source of power and the output mechanism of power. The engine technology is mature enough and the engine of domestic cars is not weak, so the importance of a good gearbox is even more prominent.

There are many types of gearboxes in the market, which can be roughly divided into manual gear, AMT, CVT (including E-CVT), AT and dual clutch. Each gearbox has its own advantages and disadvantages, and friends can choose according to their own preferences and actual situation. Today, let's talk about the gearbox that should be avoided when buying a car.

Dry double clutch

There are two kinds of ordinary household double clutches, namely dry double clutch and wet double clutch. Simply put, the clutch friction plate of dry dual clutch has no sealed oil groove and needs air cooling to dissipate heat. The two groups of clutch plates of wet double clutch are in a sealed oil tank, and the heat is absorbed by the transmission oil saturated with the clutch plates.

In this way, although the dry powershift has high efficiency and fast gear shifting, the gearbox is easy to overheat and bump when stopping, and it is easy to rust when passing water. Although the wet dual clutch sacrifices some transmission efficiency and shift speed, it performs well in overheating and frustration. There are several dry dual clutches in use, but the effect is not so good. Let's have a look.

1. Volkswagen dry dual clutch

At present, the most famous dry dual clutch used in the market is Volkswagen, and its internal code name is DQ200. There are many models. Let's just say that almost all the low-end low-displacement turbocharged engines of Volkswagen are equipped with it (a few 1.4T models such as Tan Yue and Tiguan L are equipped with DQ38 1 wet dual clutch).

The faults of this series gearbox are sudden start, high temperature, abnormal noise, burnt clutch plate and abnormal driving in extreme cases.

Volkswagen has indeed improved the procedure of this gearbox, reducing frequent gear shifting at low speed and improving the failure rate, but what I want to say is that it can choose wet rather than dry as far as possible.

2. Ford dry dual clutch

Ford's 6-speed dual clutch code-named DPS6 also has many problems. It is installed on Fox, Wing Bo and other models. The faults are characterized by continuous shaking of parking state, unsmooth shifting, delayed downshift and sudden acceleration of some users.

However, this gearbox has basically been abandoned by Ford. At present, Fox has used its own 8AT gearbox, and the quality and stability have been greatly improved.

3. Universal dry dual clutch

Speaking of Ford, of course, you can't miss GM. General dry dual clutch internal code is SHDT250. The assembled models are Buick, Chevrolet, Roewe and MG, and the engines are mainly 1.4T and 1.5t, which are produced by GM and SAIC.

This gearbox can be said to be as good as Ford's, and the main faults are abnormal sound and frustration. If you are unlucky, you can claim compensation during the warranty period, and many of them will be broken after the warranty period. It is suggested that the owner should check the abnormal sound early, find it early and treat it early.

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AT gearbox is a more reliable choice nowadays, but GM is also doing badly. Everyone is familiar with the current universal 6AT. In fact, it is the third generation product, and the first and second generations are really worrying (discontinued).

This 6AT is internally code-named GF6 series, and its models are mainly Cruze, Mai Rui Bao, Excelle and Regal produced by GM in 2009-20 15.

The faults are slow shift, out of gear, cold car immobility, weak refueling and reverse gear failure. Another thing is that it has almost no problem on the kilometer. This kind of gearbox is commonly known as "metal mixer" in the industry, mainly because the buffer is too thin and easy to break. Car owners should try not to drive violently, and changing the oil on time may help.

The third generation 6AT has been improved to solve this problem. At present, it is widely used in the market with good quality. Moreover, the latest 9AT of the GM family has good performance and can be purchased with confidence.

Continuous variable transmission

1. Bang Qi continuously variable transmission

This CVT is internally code-named VT series and has a wide range of carrying. Domestic brands such as Geely, Haima, Jianghuai, BYD, Great Wall, Landwind, BAIC and Zotye are all used, mainly for low-end models.

The gearbox failure is characterized by sudden start, abnormal sound, instrument failure light, abnormal internal wear and even loss of power in extreme cases. Many models have problems before driving to 654.38+ 10,000 kilometers, and the maintenance price is not low.

The main reasons are poor matching between engine and gearbox and domestic production technology. If you happen to be using this gearbox now, it is suggested to drive it gently and maintain it on time, which will improve the problem.

It's not that domestic cars are not good, but that our CVT in Wan Liyang is good.

2. Nissan CVT

It is not accurate to call it Nissan CVT. This gearbox brand is JATOC, which is one of the three largest gearbox manufacturers in the world, and Mitsubishi and other models also use this gearbox. There is nothing wrong with this gearbox in Japan, but there are many problems with domestic Nissan models (Mitsubishi is still imported).

The main faults are abnormal sound, abnormal bearing wear, frustration, slippage and insufficient power. The reason is the use of domestic materials, abnormal wear of bearings and steel belts, and the iron filings produced damage the solenoid valve. Of course, the assembly process is not excluded.

This gearbox had few problems before it was made in China. Now the failure rate of the same gearbox imported and made in China is very different, so it really shouldn't be.

There are many models of the above gearboxes. Of course, not every gearbox will have problems, but it is still recommended to buy according to your actual needs. After buying them, you should be familiar with their characteristics and drive and maintain them on time, so that the probability of problems will be lower.

What do you want to say about these gearboxes? Anything else to add? Welcome to leave a message

This article comes from car home, the author of the car manufacturer, and does not represent car home's position.