Is it Necessary to Rebuild Your Transmission in Belleville, IL?

Auto Repair

With how many cars and manufacturers there are, there are many types of transmissions. While most transmissions will work fine in their vehicle, there are many transmissions that are doomed to malfunction over time. An example of such a transmission is called an AW55-50SN. Transmissions like these claim they can be fitted into a variety of different vehicles from many different manufacturers such as Volvo, Nissan, General Motors, and more, however, in reality, these transmissions tend not to be as universal and interchangeable as they say they are. You may need to take your vehicle to your local Belleville, IL auto repair shop to have your transmission repaired or replaced, but some may wonder if it is just a better idea to rebuild your transmission. Here we will be going into detail about common transmission issues and if it is a good idea to have your transmission rebuilt or not.

Your Transmission

One of the most common ways that people will try to deal with any issues that they encounter with their vehicle’s transmission is to attempt to add large amounts of fluid. People with little to no experience with working on vehicles will try this and they will find they cause more damage to their transmission. It is for the best that if you run into any issues with your vehicle if you are not experienced in fixing the issue, you should have your vehicle fixed by your local Belleville, IL professionals. These people are very knowledgeable about what they are doing, and they can get your vehicle running in tip-top shape in no time.

If you have too low of fluid or too high of fluid in your transmission, it can cause erratic pressure or even poor linear solenoid control which can cause the transmission control module (TCM) to exert large amounts of pressure. When your linear solenoids (SLS, SLT, and SLU) read this high pressure, they will react as they should in the situation. Your linear solenoids are used to determine the engagement via adjusting hydraulic pressure. The shift solenoids (S1, S2, S3, S4, and S5) are what is used to determine the parameters of shift points which are based on the vehicle’s speed and the accelerator pedal. The overall quality of the shift is determined using the control of the torque within the transmission.

More about Your Transmission

Your transmission has two different modes, one for normal driving, and the other is used for driving during the winter. The shifting and lockups will occur at different speeds depending on the mode. There are a few different types of linear solenoids used by your vehicle.

  • SLT: This is the line pressure solenoid which is usually an open 3-port type.
  • TCM: This controls the transmission using 300 Hz which it uses to measure the correct amount of pressure. When there is an electronic failure, it is designed to use maximum line pressure.
  • SLS: This kind of solenoid is used for shift pressure. Similar to SLT, it’s a 3-port type and it runs at the exact same frequency and currents. It is adjusted depending on the driving conditions and the load of the vehicle.
  • SLU: This is the torque converter lockup pressure control. It is not a 3-port type.

If any of those solenoids fail, it can cause issues with your transmission. Your transmission fluid sensor (TFT) is a thermistor which is a part of the internal wiring. It uses 5 volts and depending on the temperatures, it will send a signal back to the TCM which will help it calculate the quality of the shift and will also signal the torque converter clutch (TCC) operations.

Common Problems

Your forward clutch valve is what responds to the throttle signal and is what helps regulate drive fluid on the forward clutch. If you have any issues with this valve it can cause harsh and firm engagement from neutral to drive. Since that valve is in charge of the fluid in the forward clutch circuit if it gets stuck it will cause no drive or slip conditions. It can cause even more issues than just that if left untouched. You will find that valve body components are the most prevalent and major issue that affects transmissions.


By replacing the solenoids and rebuilding the valve, it can potentially save customers on having the entire transmission serviced. Your transmission may not need to be replaced or rebuilt in its entirety, no matter what your mechanic tells you. If you believe that you do not need to rebuild everything, try getting a second opinion.

If you are looking for an auto body shop that can replace or rebuild parts or your entire transmission in Belleville, IL, give our reputable team over at Marshall’s Transmission a call today! We fix A large selection of makes of vehicles and transmissions.

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