10 Speed Valve Body Replacement

[Tom73]

Just saw this on GM Authority:

 

A new GM valve body is now arriving at dealerships, GM Authority has learned. The arrival of the new part marks a critical step toward resolving a widespread parts shortage that has left many GM truck and SUV owners waiting months for repairs. The updated component is intended to replace defective valve bodies found in certain GM 10-speed automatic transmissions, while also hopefully eliminating lengthy backorder delays that have affected service departments nationwide.
 

Impacted vehicles potentially include all ICE-powered full-size GM trucks and SUV nameplates, covering both gasoline and diesel variants. These include the Chevy Silverado 1500, GMC Sierra1500, Chevy Tahoe and Suburban, GMC Yukon and Yukon XL, and the Cadillac Escalade and Escalade ESV.

The new valve body is tagged with part number 24071206, and is compatible with the GM 10L60, 10L80, and 10L90 transmissions. Replacing the component costs roughly $1,500 when factoring in a $1,000 core exchange credit, with an upfront cost of $2,500 without the core exchange. The kit includes one-time-use bolts that must be installed in specific locations. The service also requires a transmission filter and fluid change, which are not included in that price.

 

While it remains unclear whether this new GM valve body is officially a second- or third-generation design, it does feature different bolts than its predecessor, suggesting significant internal changes.

 

As GM Authority reported previously, certain valve bodies in GM’s 10-speed transmissions can fail due to a miscommunication between the transmission hardware and its control module software. This failure can cause a momentary rear-wheel lock-up, possibly when downshifting from eighth gear, creating a potential safety hazard. Late last year, GM released special coverage N242454441 to address the issue, covering certain 2020-through-2022-model-year full-size trucks and SUVs for 15 years or 150,000 miles from the original in-service date.

For months, a shortage of replacement valve bodies has resulted in a long queue of non-operational customer vehicles waiting on repairs. The arrival of the updated GM valve body could finally ease that backlog for both customers and dealerships.

[Bikerjon]

13 hours ago, Tom73 said:

Just saw this on GM Authority:

 

A new GM valve body is now arriving at dealerships, GM Authority has learned. The arrival of the new part marks a critical step toward resolving a widespread parts shortage that has left many GM truck and SUV owners waiting months for repairs. The updated component is intended to replace defective valve bodies found in certain GM 10-speed automatic transmissions, while also hopefully eliminating lengthy backorder delays that have affected service departments nationwide.
 

 

Impacted vehicles potentially include all ICE-powered full-size GM trucks and SUV nameplates, covering both gasoline and diesel variants. These include the Chevy Silverado 1500, GMC Sierra1500, Chevy Tahoe and Suburban, GMC Yukon and Yukon XL, and the Cadillac Escalade and Escalade ESV.

The new valve body is tagged with part number 24071206, and is compatible with the GM 10L60, 10L80, and 10L90 transmissions. Replacing the component costs roughly $1,500 when factoring in a $1,000 core exchange credit, with an upfront cost of $2,500 without the core exchange. The kit includes one-time-use bolts that must be installed in specific locations. The service also requires a transmission filter and fluid change, which are not included in that price.

 

While it remains unclear whether this new GM valve body is officially a second- or third-generation design, it does feature different bolts than its predecessor, suggesting significant internal changes.

 

 

As GM Authority reported previously, certain valve bodies in GM’s 10-speed transmissions can fail due to a miscommunication between the transmission hardware and its control module software. This failure can cause a momentary rear-wheel lock-up, possibly when downshifting from eighth gear, creating a potential safety hazard. Late last year, GM released special coverage N242454441 to address the issue, covering certain 2020-through-2022-model-year full-size trucks and SUVs for 15 years or 150,000 miles from the original in-service date.

For months, a shortage of replacement valve bodies has resulted in a long queue of non-operational customer vehicles waiting on repairs. The arrival of the updated GM valve body could finally ease that backlog for both customers and dealerships.

Good news! I had not heard about this.

[Tom73]

A 3rd gen valve body is now out per GM Authority. 
…………………………..
 

Last month, GM Authority reported that GM was in the process of launching a redesigned valve body for the ten-speed automatic transmissions used in its full-size pickup trucks and SUVs. Now, we’re back with a few more exclusive details about the new, third-generation GM valve body.

Gen 3 Naming

First and foremost, GM is officially referring to the new valve body as Gen 3 or “third-generation valve body assembly.” For those questioned the terminology in our initial report, the new GM valve body – as you’ll see below – has received a not-insignificant redesign compared to the outgoing part.

 

Transmissions & Part Numbers

The new GM Gen 3 valve body assembly is for T1 platform vehicles equipped with GM’s Hydra-Matic 10L60, 10L80, and 10L90 10-speed automatic transmissions used in the automaker’s light duty full-size trucks and SUVs, including:

• Chevrolet Silverado 1500
• Chevrolet Tahoe
• Chevrolet Suburban
• GMC Sierra 1500
• GMC Yukon
• GMC Yukon XL
• Cadillac Escalade
• Cadillac Escalade ESV

Valve Body	Part #	Note
Gen 1	24044193, 24047996	First-gen, discontinued
Gen 2	24065353, 24065354	Second-gen, discontinued
Gen 3 (new)	24071206	3.0L LM2 / LZ0 Diesel
Gen 3 (new)	24071207	5.3L V8 Gasoline, 6.2L V8 Gasolne

Note that the 10-speed and Allison-branded 10-speed automatics used in the Silverado HD and Sierra HD use a different valve body.

What Actually Changed?

Prior to the Gen 3 part, GM was running the Gen 1 valve body (part numbers 24044193 and 24047996), which exhibited all kids of issues and failures that led to its eventual discontinuation. It was replaced with the Gen 2 valve body (part 24065353 and 24065354), which marked a slight improvement but exhibited a condition that resulted in excessive bore wear that caused failures.

In 2024, GM went on to make a key material change to this valve body design in order to resolve the excessive bore wear condition. Despite this change, GM didn’t change the part number. While this material change resolved the excessive bore wear issue, it still presented issues, causing GM to embark on a complete redesign of the valve body.

The result of those efforts is the Gen 3 GM valve body (part numbers 24071206 and 24071207). This new, third-generation unit includes the material change made to the Gen 2 in 2024, while also making “various other improvements”. Citing competitive reasons, GM didn’t specify what it changed for the Gen 3 hardware.

From what GM Authority has observed so far, vehicles equipped with the new Gen 3 GM valve body are presenting with substantially smoother shifting behavior and fewer failures, though it’s still relatively early in the Gen 3’s lifecycle to make any conclusive determinations on the latter.

Availability

GM has discontinued the Gen 1 and 2 valve bodies, with dealers now switching entirely to the Gen 3 assembly for service repairs, and assembly plants now using the new hardware.

Availability of the Gen 3 part is rapidly improving, which should come as great news for customers who have had their vehicles waiting on parts, sometimes for weeks or even months. Here’s to hoping that third time’s the charm!

[Bikerjon]

23 hours ago, Tom73 said:

A 3rd gen valve body is now out per GM Authority. 
…………………………..
 

 

Last month, GM Authority reported that GM was in the process of launching a redesigned valve body for the ten-speed automatic transmissions used in its full-size pickup trucks and SUVs. Now, we’re back with a few more exclusive details about the new, third-generation GM valve body.

Gen 3 Naming

First and foremost, GM is officially referring to the new valve body as Gen 3 or “third-generation valve body assembly.” For those questioned the terminology in our initial report, the new GM valve body – as you’ll see below – has received a not-insignificant redesign compared to the outgoing part.

 

Transmissions & Part Numbers

The new GM Gen 3 valve body assembly is for T1 platform vehicles equipped with GM’s Hydra-Matic 10L60, 10L80, and 10L90 10-speed automatic transmissions used in the automaker’s light duty full-size trucks and SUVs, including:

• Chevrolet Silverado 1500
• Chevrolet Tahoe
• Chevrolet Suburban
• GMC Sierra 1500
• GMC Yukon
• GMC Yukon XL
• Cadillac Escalade
• Cadillac Escalade ESV

Valve Body	Part #	Note
Gen 1	24044193, 24047996	First-gen, discontinued
Gen 2	24065353, 24065354	Second-gen, discontinued
Gen 3 (new)	24071206	3.0L LM2 / LZ0 Diesel
Gen 3 (new)	24071207	5.3L V8 Gasoline, 6.2L V8 Gasolne

Note that the 10-speed and Allison-branded 10-speed automatics used in the Silverado HD and Sierra HD use a different valve body.

What Actually Changed?

Prior to the Gen 3 part, GM was running the Gen 1 valve body (part numbers 24044193 and 24047996), which exhibited all kids of issues and failures that led to its eventual discontinuation. It was replaced with the Gen 2 valve body (part 24065353 and 24065354), which marked a slight improvement but exhibited a condition that resulted in excessive bore wear that caused failures.

In 2024, GM went on to make a key material change to this valve body design in order to resolve the excessive bore wear condition. Despite this change, GM didn’t change the part number. While this material change resolved the excessive bore wear issue, it still presented issues, causing GM to embark on a complete redesign of the valve body.

The result of those efforts is the Gen 3 GM valve body (part numbers 24071206 and 24071207). This new, third-generation unit includes the material change made to the Gen 2 in 2024, while also making “various other improvements”. Citing competitive reasons, GM didn’t specify what it changed for the Gen 3 hardware.

From what GM Authority has observed so far, vehicles equipped with the new Gen 3 GM valve body are presenting with substantially smoother shifting behavior and fewer failures, though it’s still relatively early in the Gen 3’s lifecycle to make any conclusive determinations on the latter.

Availability

GM has discontinued the Gen 1 and 2 valve bodies, with dealers now switching entirely to the Gen 3 assembly for service repairs, and assembly plants now using the new hardware.

Availability of the Gen 3 part is rapidly improving, which should come as great news for customers who have had their vehicles waiting on parts, sometimes for weeks or even months. Here’s to hoping that third time’s the charm!

Gonna try to get a Gen 3 installed in my truck under warranty. We will see!

[dennismc]

Theres also an outfit called NextGen drivetrain that is selling an upgraded valve body for the 10 speeds, theirs are $3495 plus $1000 core charge. Be interesting how they compare.

 

[Black02Silverado]

On 9/18/2025 at 4:08 PM, dennismc said:

Theres also an outfit called NextGen drivetrain that is selling an upgraded valve body for the 10 speeds, theirs are $3495 plus $1000 core charge. Be interesting how they compare.

 

Or you can get the kit and upgrade yours for less and it is very easy to do. They provide well written instructions.

[Ronjon]

Suncoast has a valve body as well, idk what Gen design it uses though. $1600 no core charge I believe.