The 2017 Chevy Silverado, a workhorse known for its reliability and capability, unfortunately, isn't immune to problems. While generally a dependable truck, a significant number of owners have reported issues with its transmission, specifically the 8-speed automatic (8L90) and, to a lesser extent, the 6-speed automatic (6L80). These problems range from annoying shuddering and harsh shifting to more serious failures that can leave you stranded. Understanding these issues, their causes, and potential solutions can save you time, money, and a whole lot of frustration. Let's dive into the specifics of what's going on with these transmissions and how to deal with it.

Is Your Silverado Shaking, Rattle, and Rolling? Let's Talk About the "Chevy Shake"

One of the most widely reported and frustrating issues plaguing 2017 Silverados, particularly those equipped with the 8-speed automatic transmission, is the dreaded "Chevy Shake," also known as the "torque converter shudder." This manifests as a noticeable vibration or shudder, typically felt between 25 and 80 mph, especially during light acceleration or when the transmission is in higher gears. It feels like you're driving over a mildly bumpy road, even on a perfectly smooth surface.

What's causing this shudder? The primary culprit is believed to be moisture accumulating in the transmission fluid. This moisture degrades the fluid's properties, affecting its ability to properly lubricate and regulate the clutch packs within the torque converter. The torque converter, in simple terms, is what allows the engine to keep running even when the wheels are stopped. When the fluid is compromised, the torque converter doesn't engage and disengage smoothly, leading to the shudder.

How do you know if it's the "Chevy Shake"?

  • The vibration is most pronounced between 25 and 80 mph.
  • It occurs during light acceleration or cruising at a steady speed.
  • The feeling is similar to driving over a slightly bumpy surface.
  • The vibration may disappear or lessen when accelerating harder or shifting into a lower gear.

Okay, So it's Shaking. What Can You Do About It?

Fortunately, there are several potential solutions to address the "Chevy Shake." The effectiveness of each solution can vary depending on the severity of the issue and other factors like driving habits and maintenance history.

  • Transmission Fluid Flush: This is often the first and most recommended course of action. A complete transmission fluid flush replaces the old, contaminated fluid with fresh, clean fluid. This helps to remove moisture and restore proper lubrication within the transmission. Important: Make sure the shop uses the correct transmission fluid specified for your Silverado's transmission. Using the wrong fluid can cause more problems than it solves. The correct fluid for the 8L90 is typically Dexron HP.

  • Triple Flush Procedure: Some technicians recommend a "triple flush" procedure. This involves flushing the transmission fluid three times, with short driving intervals between each flush, to ensure that as much of the old fluid and contaminants as possible are removed.

  • Torque Converter Replacement: In some cases, the shudder may be caused by damage to the torque converter itself. If fluid flushes don't resolve the issue, replacing the torque converter might be necessary. This is a more expensive repair but can be a permanent solution.

  • Software Updates: Sometimes, the transmission control module (TCM) software can contribute to the shudder. A software update from your Chevy dealer can recalibrate the TCM, improving shift quality and potentially reducing or eliminating the shudder.

  • Valve Body Replacement: The valve body is the "brain" of the transmission, controlling the flow of fluid to various parts. A faulty valve body can cause erratic shifting and shuddering. Replacing the valve body can sometimes resolve these issues.

Beyond the Shakes: Other 2017 Silverado Transmission Woes

While the "Chevy Shake" is the most common complaint, 2017 Silverado owners have reported other transmission-related issues.

  • Harsh or Erratic Shifting: This can manifest as clunky or abrupt shifts between gears, making for an uncomfortable driving experience. It can be caused by low transmission fluid, a faulty valve body, or issues with the TCM.

  • Slipping Gears: This occurs when the transmission momentarily loses power or fails to engage the correct gear. It can be a sign of internal damage to the transmission and should be addressed promptly.

  • Delayed Engagement: This is when there's a noticeable delay between shifting into drive or reverse and the transmission actually engaging. It can be caused by low fluid, a failing pump, or internal wear.

  • Transmission Overheating: Overheating can damage the transmission and lead to premature failure. Symptoms include a burning smell, sluggish performance, and warning lights on the dashboard. It can be caused by low fluid, a clogged transmission cooler, or excessive towing.

  • Complete Transmission Failure: In the worst-case scenario, the transmission can fail completely, leaving you stranded. This is often preceded by other symptoms, but it can sometimes occur suddenly.

Digging Deeper: The 8L90 vs. the 6L80

The 2017 Silverado came with two main automatic transmission options: the 8-speed 8L90 and the 6-speed 6L80. While both have experienced issues, the 8L90 has been the subject of far more complaints, particularly regarding the "Chevy Shake."

  • 8L90 (8-Speed): This transmission is known for its wide gear ratio spread, which contributes to improved fuel economy and performance. However, it's also more complex than the 6L80 and has been more prone to issues like shuddering and harsh shifting.

  • 6L80 (6-Speed): This transmission is generally considered more reliable than the 8L90. While it can still experience problems like slipping gears or harsh shifting, these issues are less common.

How do you know which transmission you have? Check your Silverado's service sticker, usually located in the glove box. It will list the RPO (Regular Production Option) codes. Look for the codes "M5U" (8L90) or "MYC" (6L80).

Prevention is Key: Keeping Your Silverado's Transmission Happy

While some transmission problems are unavoidable, there are steps you can take to minimize the risk and prolong the life of your Silverado's transmission.

  • Regular Transmission Fluid Changes: Follow the manufacturer's recommended maintenance schedule for transmission fluid changes. This is crucial for keeping the fluid clean and preventing moisture buildup.

  • Use the Correct Transmission Fluid: Always use the specific type of transmission fluid recommended for your Silverado. Using the wrong fluid can damage the transmission.

  • Avoid Overloading: Don't exceed your Silverado's towing or payload capacity. Overloading puts extra strain on the transmission, increasing the risk of overheating and damage.

  • Drive Sensibly: Avoid aggressive acceleration and hard braking, as these can put unnecessary stress on the transmission.

  • Address Issues Promptly: If you notice any signs of transmission problems, such as shuddering, harsh shifting, or slipping gears, take your Silverado to a qualified mechanic as soon as possible. Addressing issues early can prevent them from escalating into more serious and expensive repairs.

What About Recalls and Lawsuits?

Due to the widespread reports of transmission problems, particularly with the 8L90, there have been multiple class-action lawsuits filed against General Motors. While some of these lawsuits have been settled, they often involve specific model years and specific remedies.

Important: Check with your local Chevy dealer or consult with a legal professional to determine if your Silverado is covered by any recalls or settlements related to transmission issues.

DIY vs. Professional Help: When to Wrench and When to Run

Some minor transmission issues, such as checking and topping off the fluid, can be handled by a mechanically inclined owner. However, more complex repairs, such as fluid flushes, valve body replacements, or torque converter replacements, should be left to a qualified mechanic.

When to DIY:

  • Checking and topping off transmission fluid.
  • Replacing simple sensors (with proper research and tools).

When to Seek Professional Help:

  • Any internal transmission repairs.
  • Fluid flushes.
  • Valve body replacements.
  • Torque converter replacements.
  • Software updates.
  • Any repair that requires specialized tools or diagnostic equipment.

Frequently Asked Questions

  • What's the most common problem with the 2017 Silverado transmission? The "Chevy Shake" or torque converter shudder is the most frequently reported issue, especially with the 8L90 transmission.

  • How much does it cost to fix the "Chevy Shake"? A transmission fluid flush typically costs between $150 and $300, while a torque converter replacement can range from $800 to $2000 or more.

  • Is the 8L90 transmission reliable? While it offers good fuel economy and performance, the 8L90 has been known to have reliability issues, particularly the shudder problem.

  • Can I drive my Silverado with the "Chevy Shake"? While it might be tempting to ignore it, driving with the shudder can eventually lead to more serious transmission damage.

  • Does a transmission fluid flush always fix the shudder? A fluid flush is often the first step, but it's not always a guaranteed fix. Other repairs, like a torque converter replacement, might be necessary.

The Bottom Line

Transmission problems in the 2017 Chevy Silverado, particularly the "Chevy Shake," are a common concern. Understanding the potential issues, their causes, and the available solutions is crucial for keeping your truck running smoothly and avoiding costly repairs. Address any symptoms promptly and seek professional help when needed to ensure the longevity of your Silverado's transmission.