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Originally Posted On: https://jimsexcelauto.com/what-you-should-know-about-transmission-repairs/

What You Should Know About Transmission Repairs

Perhaps you already know that transmission systems transfer power from the engine to the wheels, allowing your vehicle to move at varying speeds. Whether automatic or manual, you rely on this system to adjust torque and ensure the engine operates efficiently at any given speed.

But did you know that transmission repairs often address more than just fluid changes or minor adjustments? Common issues like worn clutches, damaged seals, or faulty solenoids can cause significant performance problems that require careful diagnosis to address.

With Jim’s Excel Collision & Automotive Repair’s mechanics, take a closer look at how transmission systems work, from identifying the early signs of trouble to understanding the complex technology behind these systems.

How Vehicle Transmission Works

Your vehicle’s transmission allows you to change speeds while keeping the engine running at an efficient range. It adjusts the engine’s output to match the driving speed, regulating the torque that reaches the wheels. This ensures smooth acceleration/deceleration without straining the engine.

In a manual transmission, you select the gears using a clutch pedal and gear shifter. The clutch disconnects the engine from the transmission, allowing you to change gears. It requires coordination between the clutch and throttle to engage the correct gear for your vehicle’s speed.

An automatic transmission shifts gears independently based on input from your vehicle’s sensors and control modules. It uses a torque converter instead of a clutch and relies on fluid pressure to manage gear changes. It’s a bit more complex mechanically but offers a smoother driving experience.

Are Automatic and Manual Transmission Repairs Different?

Some automatic and manual transmission systems differ. Repairs for automatic transmissions often involve addressing electronic issues, hydraulic system problems, or fluid leaks.

Here are a few examples for automatic systems:

• Replacing the torque converter
• Fixing a transmission fluid leak (this can still happen in manual systems)
• Repairing or recalibrating the transmission control module (TCM)

Manual transmission repairs typically involve replacing worn clutches and gears or fixing mechanical linkages. Since manual systems are more straightforward, they often cost less to fix and are sometimes easier to diagnose, though that depends on the severity of damage and the affected parts.

Here are a few examples for manual systems:

• Repairing a damaged synchronizer
• Fixing a faulty gear shifter linkage
• Repairing a damaged flywheel (called flexplates in automatic vehicles)

What Are Common Signs of Car Transmission Issues?

Car transmission issues tend to manifest through delayed or rough shifting, which is the most common symptom. This happens because the transmission struggles to properly engage gears due to various electrical malfunctions, low fluid levels, or worn components.

At this point, you may ask—are there other systems that can affect the transmission and mimic these issues? Yes, components like the engine control module (ECM), throttle position sensor, or even the vehicle’s electrical system can cause similar symptoms. But more on diagnostics later…

Here are a few signs of transmission issues:

• Slipping gears: Your vehicle may unexpectedly shift out of gear or struggle to stay in gear, causing a loss of power or difficulty accelerating.
• Delayed or rough shifting: You might notice hesitation when shifting between gears or a jerking sensation during gear changes.
• Unusual noises: Grinding, whining, or clunking sounds while the car is in gear often indicate worn or damaged transmission components.

Unusual noises are a fairly ubiquitous symptom in vehicles. In transmission systems specifically, keep in mind that these sounds often occur specifically when shifting gears or while the car is in gear.

Is a Transmission Rebuild Worth It?

A transmission rebuild involves disassembling the entire transmission, inspecting each component, and replacing worn or damaged parts like gears, seals, and bearings. The goal is to restore the transmission to its original performance by reusing the core structure while replacing faulty elements.

Rebuilds are typically necessary only when multiple parts of your transmission are failing, and a simple repair won’t address the underlying issues. It’s a more comprehensive solution than a single repair, targeting all the worn components at once, which can help avoid recurring problems.

A rebuild can sometimes cost significantly less than a full replacement. Keeping the original casing and structure intact offers a sort of middle ground between the higher average cost of a replacement and the limitations of certain individual repairs.

Car Diagnostics for Your Transmission System

Diagnostics for your car’s transmission system begin with a scan of your vehicle’s onboard systems, checking for error codes that indicate transmission-related problems. This can reveal issues like faulty sensors, low fluid pressure, or mechanical malfunctions. This step is a starting point for further investigation.

For example, if the scan reveals a torque converter clutch solenoid malfunction, it could be why your transmission is slipping between gears. Only after identifying the issue should you perform a visual inspection or fluid check to confirm the problem and determine the most effective repair method.

Why You Need Transmission Fluid Change

Your vehicle relies on different types of fluids to function smoothly, and transmission fluid is one of the most important. This fluid is responsible for lubricating the internal components of your transmission, allowing you to shift without fighting the gear.

Transmission fluid also helps ensure that your gears engage correctly, particularly in automatic transmissions, where it controls the pressure needed for shifting. Without it, your transmission would wear out quickly and cause serious and costly issues.

However, this fluid degrades and becomes contaminated with metal particles and debris. If you don’t replace it, internal components will experience increased friction. Most manufacturers recommend changing fluid around every 50,000 miles or so, depending on your vehicle.

Why You Need To Calibrate Your Transmission Control Modules

Transmission control modules (TCMs) are electronic devices that manage how and when your vehicle’s transmission shifts gears. They receive input from various sensors, such as speed and throttle position, and send commands to adjust shifting for optimal performance.

When you get transmission repairs, especially with major components like the valve body or torque converter, recalibrating the TCM may be necessary. Calibration ensures that the TCM correctly interprets sensor data and coordinates with the newly repaired parts.

Book Your Transmission Repair Service

You can schedule your transmission repair service today with Jim’s Excel Collision & Automotive Repair. We offer same-day appointments whenever possible and handle anything from minor adjustments to major repairs.

We also make it a priority to follow up with you to ensure your transmission is running smoothly after service. Do you have any questions about specific issues? You can always reach us at (610) 369-3700.