How to choose a used automatic transmission for auto disassembly?

Automatic transmission is a complex mechanism, the overhaul of which requires high professional skills of performers and significant financial investments. In the event of a serious breakdown of the automatic transmission, the owner of the car has a legitimate question - "Repair or buy a used box?".
In most cases, buying a used automatic transmission will cost twice as much as the cost of restoration work. From the point of view of car owners, such arithmetic looks very tempting. The advantages include the absence of problems with ordering spare parts and a long wait for the completion of repairs. At the same time, many people forget that the selection and purchase of a used automatic transmission is a rather difficult task that requires a serious approach. Let's look at the features of choosing an automatic transmission and tell you about the pitfalls of this procedure. 

    
Varieties
Usually, companies engaged in the sale of used spare parts offer customers gearboxes removed from decommissioned cars. The condition of such spare parts is quite difficult to assess. An indirect factor can only be the mileage of the car. If you are lucky, you will get a box that was removed from a new vehicle that was involved in an accident.
Some companies offer refurbished boxes that have undergone the procedure of diagnostics and replacement of consumables. However, such companies are quite rare.
An alternative option is imported imported spare parts. This term means the supply of spare parts from car disassembles located in different countries of Europe, Asia or America. Components and assemblies are usually removed from emergency vehicles, which guarantees excellent condition of the goods. The advantages of contract spare parts include the absence of operation in difficult conditions, as well as complete accompanying information for each unit of goods.
Tips for the buyer
On: website you can find a lot of ads for the sale of used automatic transmissions. Some offers look very attractive. If you do not want to add to the list of car owners who were unlucky with the purchase of a used box, do not respond to the cheapest offers, contact several sellers, collect information.
That is why when buying an automatic transmission or any other used spare parts, it is necessary to choose proven companies with positive reviews that really guarantee the quality of the goods and on time.
Compatibility of spare parts plays an important role. The design of the selected gearbox should not differ from the existing gearbox. Otherwise, the owner of the car risks facing serious problems:
• Different design of the mechanical part.
* Mismatch of connecting dimensions.
* Different number of fasteners in the lower support.
* Incompatibility of the electronic control unit.
Responsible sellers always offer assistance in the selection of automatic transmissions and other complex components. The competent use of data on the modification of the gearbox speaks of the seller as a technically competent specialist.
Visual inspection
The assessment of the condition of the automatic transmission must begin with a visual inspection. There should be no dents or cracks on the case. Such defects can lead to pressure loss or increased vibration caused by geometry changes. 

    
 
Oil with a burning smell is a sign of problems with the clutches. It is better to refrain from purchasing such a box. When there is a lack of pressure, the friction discs begin to slip. Under the influence of the friction force, accelerated wear of the friction surface occurs, which leads to a burning smell. Subsequently, glue and lining particles clog the channels of the hydro block. This leads to oil starvation and accelerated wear of rubbing parts. 
Metal shavings on a magnet are another sign of serious problems with the box. It is strictly forbidden to install such an automatic transmission on a car. Metal particles will get into the heat exchanger and as a result, the owner of the car will get an additional problem. 

    
 
Checking the automatic transmission in operation
If visual inspection has not revealed any problems, the box must be installed on the car. After all, only the direct operation of an automatic transmission can give a complete picture. Consider the main signs of malfunction of the automatic transmission:
1. Knocks and bumps when moving the selector. A slight force is allowed that occurs when the torque is transmitted to the wheels in Drive and Reverse mode.
2. The car remains stationary in Drive mode after the driver has released the brake pedal.
3. Bumps, vibrations, grinding and extraneous sounds during movement.
4. Poor acceleration dynamics or dropping of steps by jerks.
5. Late gearshift.
As you can see, it all comes down to vibrations, bumps, and jolts, as well as the discrepancy between the engine speed and the overall dynamics of the car. Naturally, a used gearbox cannot be compared with a new one. However, the presence of the above disadvantages is a reason to refuse to buy.
Result
Before buying spare parts, we strongly recommend making sure that the problems with the old unit are serious. Make a thorough diagnosis and make decisions, or maybe you will be lucky and you will manage with a simple replacement of several parts.
If you have decided on a used automatic transmission, start with our website. In the catalog you will find a large number of offers from trusted companies that offer favorable terms of cooperation. Automatic transmission is a complex mechanism, the overhaul of which requires high professional skills of performers and significant financial investments. In the event of a serious breakdown of the automatic transmission, the owner of the car has a legitimate question - "Repair or buy a used box?".
In most cases, buying a used automatic transmission will cost twice as much as the cost of restoration work. From the point of view of car owners, such arithmetic looks very tempting. The advantages include the absence of problems with ordering spare parts and a long wait for the completion of repairs. At the same time, many people forget that the selection and purchase of a used automatic transmission is a rather difficult task that requires a serious approach. Let's look at the features of choosing an automatic transmission and tell you about the pitfalls of this procedure. 
 
Varieties
Usually, companies engaged in the sale of used spare parts offer customers gearboxes removed from decommissioned cars. The condition of such spare parts is quite difficult to assess. An indirect factor can only be the mileage of the car. If you are lucky, you will get a box that was removed from a new vehicle that was involved in an accident.
Some companies offer refurbished boxes that have undergone the procedure of diagnostics and replacement of consumables. However, such companies are quite rare.
An alternative option is imported imported spare parts. This term means the supply of spare parts from car disassembles located in different countries of Europe, Asia or America. Components and assemblies are usually removed from emergency vehicles, which guarantees excellent condition of the goods. The advantages of contract spare parts include the absence of operation in difficult conditions, as well as complete accompanying information for each unit of goods.
Tips for the buyer
On: website you can find a lot of ads for the sale of used automatic transmissions. Some offers look very attractive. If you do not want to add to the list of car owners who were unlucky with the purchase of a used box, do not respond to the cheapest offers, contact several sellers, collect information.
That is why when buying an automatic transmission or any other used spare parts, it is necessary to choose proven companies with positive reviews that really guarantee the quality of the goods and on time.
Compatibility of spare parts plays an important role. The design of the selected gearbox should not differ from the existing gearbox. Otherwise, the owner of the car risks facing serious problems:
• Different design of the mechanical part.
* Mismatch of connecting dimensions.
* Different number of fasteners in the lower support.
* Incompatibility of the electronic control unit.
Responsible sellers always offer assistance in the selection of automatic transmissions and other complex components. The competent use of data on the modification of the gearbox speaks of the seller as a technically competent specialist.
Visual inspection
The assessment of the condition of the automatic transmission must begin with a visual inspection. There should be no dents or cracks on the case. Such defects can lead to pressure loss or increased vibration caused by geometry changes. 
 
Oil with a burning smell is a sign of problems with the clutches. It is better to refrain from purchasing such a box. When there is a lack of pressure, the friction discs begin to slip. Under the influence of the friction force, accelerated wear of the friction surface occurs, which leads to a burning smell. Subsequently, glue and lining particles clog the channels of the hydro block. This leads to oil starvation and accelerated wear of rubbing parts. 
Metal shavings on a magnet are another sign of serious problems with the box. It is strictly forbidden to install such an automatic transmission on a car. Metal particles will get into the heat exchanger and as a result, the owner of the car will get an additional problem. 
 
Checking the automatic transmission in operation
If visual inspection has not revealed any problems, the box must be installed on the car. After all, only the direct operation of an automatic transmission can give a complete picture. Consider the main signs of malfunction of the automatic transmission:
1. Knocks and bumps when moving the selector. A slight force is allowed that occurs when the torque is transmitted to the wheels in Drive and Reverse mode.
2. The car remains stationary in Drive mode after the driver has released the brake pedal.
3. Bumps, vibrations, grinding and extraneous sounds during movement.
4. Poor acceleration dynamics or dropping of steps by jerks.
5. Late gearshift.
As you can see, it all comes down to vibrations, bumps, and jolts, as well as the discrepancy between the engine speed and the overall dynamics of the car. Naturally, a used gearbox cannot be compared with a new one. However, the presence of the above disadvantages is a reason to refuse to buy.
Result
Before buying spare parts, we strongly recommend making sure that the problems with the old unit are serious. Make a thorough diagnosis and make decisions, or maybe you will be lucky and you will manage with a simple replacement of several parts.
If you have decided on a used automatic transmission, start with our website. In the catalog you will find a large number of offers from trusted companies that offer favorable terms of cooperation.