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  2. sku: 3042322016454752
  3. IGNITION M-404

P-D IGNITION PARTS M-404 Gm Transmission Vacuum Modulator TH400 Valve

fits model: Camaro, Chevelle, Impala.

Th400 P&d Ignition Parts M-404 Vintage Gm Transmission Vacuum Modulator Valve Camaro Chevelle Impala

( Brand: P-d Ignition Parts ), ( Manufacturer Part Number: M-404 ), ( Part Type: Vacuum Valve Transmission ), ( Manufacturer Warranty: Yes ), ( Fitment Type: Direct Replacement ), ( Items Included: Modulator ), ( Transmission Type: Automatic ), ( Country Of Origin: United States )

Review P D IGNITION PARTS Pignition Vintage Pgm Transmission Vacuum Modulator Valve fits CAMARO CHEVELLE IMPALA

The M-404 GM TH400 Transmission Vacuum Modulator Valve is an essential component for maintaining the proper vacuum level within the hydraulic system of your TH400 transmission. This valve is specifically designed for use in applications such as the Chevrolet Camaro, Chevelle, and Impala.

The M-404 valve is manufactured to OEM specifications, ensuring a perfect fit and reliable performance. It is constructed from high-quality materials, including a durable brass body and stainless steel components. This not only provides superior corrosion resistance but also ensures longevity even under the most demanding driving conditions.

The valve operates by regulating the vacuum pressure within the transmission's hydraulic system. This, in turn, controls the engagement and disengagement of the transmission's bands and clutches. The vacuum modulator valve is critical for ensuring smooth and efficient power transmission between the engine and transmission.

The M-404 valve features a simple yet effective design. It consists of a diaphragm that responds to changes in vacuum pressure, which in turn opens or closes the valve. A vacuum hose connects the valve to the intake manifold of the engine, allowing it to sense vacuum pressure.

The valve is designed to be easy to install. It comes with all necessary hardware, including a gasket and mounting bolts. The installation process is straightforward, and the valve can typically be replaced in less than an hour with basic hand tools.

In summary, the M-404 GM TH400 Transmission Vacuum Modulator Valve is a vital component for ensuring the smooth operation of your TH400 transmission in your Chevrolet Camaro, Chevelle, or Impala. Its high-quality construction, reliable performance, and easy installation make it an excellent choice for anyone seeking to maintain or upgrade their vehicle's powertrain.

Vacuum Modulator Valve for TH400 Transmission in Camaro, Chevelle, and Impala: A Detailed Analysis

The TH400 transmission vacuum modulator valve is an essential component in maintaining the proper shift points and performance of your GM vehicle, including Camaro, Chevelle, and Impala. This valve controls the transmission's shift points by responding to vacuum pressure from the engine. Here we discuss the pros and cons of buying a new vacuum modulator valve for your TH400 transmission.

Pros:

1. Improved shift quality: A new vacuum modulator valve ensures smooth and consistent shifts, enhancing your driving experience.

2. Fuel efficiency: By maintaining proper shift points, your engine will run more efficiently, saving you fuel in the long run.

3. Reliability: A new vacuum modulator valve reduces the chances of transmission-related issues, giving you peace of mind and a more dependable vehicle.

4. Cost-effective: Compared to other transmission repairs or upgrades, a vacuum modulator valve is a relatively inexpensive investment.

5. Easy installation: The vacuum modulator valve is a straightforward component to replace, making it an accessible DIY project for many enthusiasts.

Cons:

1. Availability: Finding the right vacuum modulator valve for your specific GM vehicle and transmission model can be challenging, as they come in various configurations.

2. Compatibility: Ensuring that the replacement valve is compatible with your existing transmission and engine setup is crucial to avoid potential issues.

3. DIY installation challenges: While the installation process is generally straightforward, certain challenges may arise, such as accessing the valve or removing the old one without damaging it.

4. Potential for cross-contamination: When purchasing a used vacuum modulator valve, there's a risk of cross-contamination with other vehicle's fluids, which could lead to transmission damage.

5. OEM vs aftermarket: Deciding between an OEM (original equipment manufacturer) and aftermarket vacuum modulator valve can be a challenge. OEM valves may offer better fit and compatibility but are often more expensive than aftermarket options.

In conclusion, investing in a new vacuum modulator valve for your TH400 transmission in Camaro, Chevelle, or Impala comes with several advantages, including improved shift quality, fuel efficiency, reliability, and cost-effectiveness. However, it also presents some challenges, such as availability, compatibility, and DIY installation complexities. To mitigate these issues, it's crucial to research the specific vacuum modulator valve for your vehicle and transmission configuration, consider purchasing from a reputable supplier, and be prepared for any potential installation challenges.

Recommendation:

If you're experiencing transmission shift issues or simply want to enhance your vehicle's performance, consider investing in a new vacuum modulator valve for your TH400 transmission. Ensure that you purchase the correct valve for your specific GM vehicle and transmission model, and be prepared for any potential installation challenges. By doing so, you'll enjoy improved shift quality, better fuel efficiency, and a more reliable driving experience.

Details:

Thanks storage 92us. New in box please view pics.

part #: m404 price

  • $999.99

specifications gearreb:

  • for models: Camaro, Chevelle, Impala
  • brand: P-d Ignition Parts
  • mpn: M-404
  • part type: Vacuum Valve Transmission
  • manufacturer warranty: Yes
  • fitment type: Direct Replacement
  • items included: Modulator
  • transmission type: Automatic
  • country of origin: United States

returns gearreb:

  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Seller

seller gearreb:

  • # reviews: 4937
  • city: Falconer, New York
  • rating: 99.9%

offer gearreb:

  • started: April 12, 2026
  • best offers: True
  • options: Ship-to-home
  • sold: 0
  • quantity: 1
  • availability: In Stock

shipping gearreb:

  • service: USPS Ground Advantage
  • transit: 4-9 Days
  • cost: $7.00
  • carrier: USPS
  • class: Standard
  • type: Fixed

general gearreb:

  • condition: New
  • Car Truck Parts Accessories > Transmission Drivetrain > Transmission Rebuild Kits

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for models: camaro, chevelle, impala, part type: vacuum valve transmission, manufacturer warranty: yes, fitment type: direct replacement, items included: modulator, transmission type: automatic, country of origin: united states,
category: auto parts > car truck parts accessories > transmission drivetrain > transmission rebuild kits, sku: 3042322016454752,
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2 offers $999.99–$999.99 USD
  • Offer #1: $999.99 price + $49.99 shipping estimate = $1049.98* total. Has 360 Vacuum advance works and holds. This is an early GM original big block 1966 Chevelle SS 396 375 L78 TI distributor with oil block off.+$49.99 shipping
  • Offer #2: $999.99 price + $49.99 shipping estimate = $1049.98* total. Has the correct early big block oil block off right above the drive gear. This is an early GM original big block 1966 Chevelle SS 396 375 L78 and 1965 and 1966 Impala SS 396/427 L72 TI cast iron distributor with oil block off.+$49.99 shipping

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