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Standard Ignition TM-12 Automatic Transmission Vacuum ModulatorOE Quality 60-Day Returns
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Part #: TM-12

Standard Ignition TM-12 Automatic Transmission Vacuum Modulator

⚙️ 342 vehicles fit this part
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🚗Fitment: Chevrolet, GMC, and Pontiac, Bel Air, Blazer, Bonneville, C10 Suburban, C20 Suburban, Camaro, Caprice, Catalina, Corvette, El Camino, Firebird, Grand Prix, GTO, Impala, Jimmy, K10 Suburban, K20 Suburban, LeMans, Malibu, Monte Carlo, Nova, and Tempest
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Overview of Standard Ignition TM-12 Vacuum Modulator

The Standard Ignition TM-12 automatic transmission vacuum modulator is designed to provide reliable performance for select Chevrolet, GMC, and Pontiac vehicles. Engineered with a durable brass finish and two hose connectors, this modulator ensures consistent vacuum control for smooth transmission operation.

  • Constructed with a corrosion-resistant brass finish for durability
  • Equipped with two hose connectors for secure vacuum line attachment
  • Compatible with a range of Chevrolet, GMC, and Pontiac models including Bel Air, Camaro, and Firebird
  • Part number TM-12 for precise identification and fitment

Product Details and Specifications

The TM-12 vacuum modulator from Standard Ignition is a critical component in automatic transmission systems, regulating vacuum pressure to control shift timing and firmness. Its brass construction offers enhanced resistance to wear and environmental factors, contributing to long-term reliability. The two hose connectors facilitate proper vacuum line connections, ensuring accurate modulation of transmission shifts. This part is specifically designed for use in various classic and modern vehicles such as the Chevrolet Impala, GMC Jimmy, and Pontiac Grand Prix, among others.

Compatible Vehicles and Applications

This automatic transmission vacuum modulator is compatible with multiple Chevrolet, GMC, and Pontiac models, including but not limited to:

  • Chevrolet Bel Air, Camaro, Caprice, Impala, Malibu, Monte Carlo, Nova, and C10/C20 Suburban
  • GMC Jimmy, K10/K20 Suburban, and Blazer
  • Pontiac Bonneville, Firebird, Grand Prix, GTO, Catalina, LeMans, and Tempest

Using the TM-12 modulator helps maintain proper transmission function in these vehicles by ensuring vacuum signals are accurately transmitted to the transmission valve body.

Common Issues Addressed by the TM-12 Vacuum Modulator

  • Irregular or harsh transmission shifting
  • Delayed or slipping gear engagement
  • Transmission failure to downshift properly
  • Vacuum leaks causing transmission performance problems
  • Inconsistent transmission line pressure affecting drivability

Installation Notes and Tips

When installing the Standard Ignition TM-12 vacuum modulator, ensure that both hose connectors are securely attached to the corresponding vacuum lines to prevent leaks. Verify that the vacuum lines are free of cracks or damage before installation. Proper routing of vacuum hoses is essential to maintain accurate modulation and avoid interference with other engine components. Consult the vehicle’s service manual for specific installation procedures and torque specifications.

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM specifications, providing dependable performance for your vehicle’s transmission system. The TM-12 vacuum modulator undergoes rigorous quality control to ensure durability and fitment accuracy. Please refer to Standard Ignition’s warranty policy for detailed coverage information.

BrandStandard Ignition
Part NumberTM-12
Hose Connector Quantity2
Part FinishBrass

This part fits 342 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
1973ChevroletBel AirN/A
1973ChevroletCamaro5.0LV8N/A
1973ChevroletCamaro5.7LV8N/A
1973ChevroletCaprice5.7LV8N/A
1973ChevroletCaprice7.4LV8N/A
1973ChevroletCaprice5.0LV8N/A
1973ChevroletCaprice4.1LL6N/A
1973ChevroletCaprice6.6LV8N/A
1973ChevroletImpala5.7LV8N/A
1973ChevroletImpala7.4LV8N/A
1973ChevroletImpala5.0LV8N/A
1973ChevroletImpala6.6LV8N/A
1973ChevroletMonte Carlo7.4LV8N/A
1973ChevroletMonte Carlo6.6LV8N/A
1973ChevroletMonte Carlo5.7LV8N/A
1972ChevroletBel AirN/A
1972ChevroletCamaro5.7LV8N/A
1972ChevroletCamaro5.0LV8N/A
1972ChevroletCamaro4.1LL6N/A
1972ChevroletCaprice5.0LV8N/A
1972ChevroletCaprice7.4LV8N/A
1972ChevroletCaprice4.1LL6N/A
1972ChevroletCaprice5.7LV8N/A
1972ChevroletCorvette7.4LV8N/A
1972ChevroletCorvette5.7LV8N/A
1972ChevroletEl CaminoN/A
1972ChevroletImpala4.1LL6N/A
1972ChevroletImpala7.4LV8N/A
1972ChevroletImpala5.0LV8N/A
1972ChevroletImpala5.7LV8N/A
1972ChevroletMonte Carlo5.7LV8N/A
1972ChevroletMonte Carlo7.4LV8N/A
1972ChevroletNovaN/A
1972PontiacBonneville6.6LV8N/Aw/ M38 Trans.
1972PontiacBonneville7.5LV8N/Aw/ M38 Trans.
1972PontiacCatalina5.7LV8N/Aw/ M38 Trans.
1972PontiacCatalina6.6LV8N/Aw/ M38 Trans.
1972PontiacCatalina7.5LV8N/Aw/ M38 Trans.
1972PontiacFirebird6.6LV8N/Aw/ M38 Trans.
1972PontiacFirebird5.7LV8N/Aw/ M38 Trans.
1972PontiacFirebirdN/A
1972PontiacFirebird7.5LV8N/Aw/ M38 Trans.
1972PontiacGrand Prix7.5LV8N/Aw/ M38 Trans.
1972PontiacGrand Prix6.6LV8N/Aw/ M38 Trans.
1972PontiacLeMans7.5LV8N/Aw/ M38 Trans.
1972PontiacLeMans4.1LL6N/A
1972PontiacLeMans5.7LV8N/A
1972PontiacLeMans6.6LV8N/Aw/ M38 Trans.
1971ChevroletBel AirN/A
1971ChevroletBlazer4.1LL6N/A
1971ChevroletBlazer4.8LL6N/A
1971ChevroletBlazer5.0LV8N/A
1971ChevroletBlazer5.7LV8N/A
1971ChevroletC10 Suburban4.1LL6N/A
1971ChevroletC10 Suburban4.8LL6N/A
1971ChevroletC10 Suburban5.0LV8N/A
1971ChevroletC10 Suburban5.7LV8N/A
1971ChevroletC10 Suburban6.6LV8N/A
1971ChevroletC20 Suburban4.1LL6N/A
1971ChevroletC20 Suburban4.8LL6N/A
1971ChevroletC20 Suburban5.0LV8N/A
1971ChevroletC20 Suburban5.7LV8N/A
1971ChevroletC20 Suburban6.6LV8N/A
1971ChevroletCamaroN/A
1971ChevroletCapriceN/A
1971ChevroletCorvetteN/A
1971ChevroletEl CaminoN/A
1971ChevroletImpalaN/A
1971ChevroletK10 Suburban4.1LL6N/A
1971ChevroletK10 Suburban5.0LV8N/A
1971ChevroletK10 Suburban5.7LV8N/A
1971ChevroletK10 Suburban6.6LV8N/A
1971ChevroletK20 Suburban4.1LL6N/A
1971ChevroletK20 Suburban4.8LL6N/A
1971ChevroletK20 Suburban5.0LV8N/A
1971ChevroletK20 Suburban5.7LV8N/A
1971ChevroletK20 Suburban6.6LV8N/A
1971ChevroletMonte Carlo7.4LV8N/A
1971ChevroletMonte Carlo5.7LV8N/A
1971ChevroletNovaN/A
1971GMCG15/G1500 Van4.1LL6N/A
1971GMCG15/G1500 Van5.0LV8N/A
1971GMCG15/G1500 Van5.7LV8N/A
1971GMCG25/G2500 Van4.1LL6N/A
1971GMCG25/G2500 Van5.0LV8N/A
1971GMCG25/G2500 Van5.7LV8N/A
1971GMCG35/G3500 Van4.1LL6N/A
1971GMCG35/G3500 Van5.0LV8N/A
1971GMCG35/G3500 Van5.7LV8N/A
1971GMCJimmy4.1LL6N/A
1971GMCJimmy4.8LL6N/A
1971GMCJimmy5.0LV8N/A
1971GMCJimmy5.7LV8N/A
1971PontiacBonneville6.6LV8N/Aw/ M38 Trans.
1971PontiacBonneville7.5LV8N/Aw/ M38 Trans.
1971PontiacBonneville5.7LV8N/Aw/ M38 Trans.
1971PontiacCatalina6.6LV8N/Aw/ M38 Trans.
1971PontiacCatalina5.7LV8N/Aw/ M38 Trans.
1971PontiacCatalina7.5LV8N/Aw/ M38 Trans.
1971PontiacFirebird6.6LV8N/Aw/ M38 Trans.
1971PontiacFirebird5.7LV8N/Aw/ M38 Trans.
1971PontiacFirebirdN/A
1971PontiacFirebird7.5LV8N/Aw/ M38 Trans.
1971PontiacGrand Prix6.6LV8N/Aw/ M38 Trans.
1971PontiacGrand Prix7.5LV8N/Aw/ M38 Trans.
1971PontiacGTO7.5LV8N/Aw/ M38 Trans.
1971PontiacGTO6.6LV8N/Aw/ M38 Trans.
1971PontiacLeMans4.1LL6N/A
1971PontiacLeMans7.5LV8N/Aw/ M38 Trans.
1971PontiacLeMans6.6LV8N/Aw/ M38 Trans.
1971PontiacLeMans5.7LV8N/A
1970ChevroletBel AirN/A
1970ChevroletBlazer4.1LL6N/A
1970ChevroletBlazer4.8LL6N/A
1970ChevroletBlazer5.0LV8N/A
1970ChevroletBlazer5.7LV8N/A
1970ChevroletC10 Suburban4.1LL6N/A
1970ChevroletC10 Suburban4.8LL6N/A
1970ChevroletC10 Suburban5.0LV8N/A
1970ChevroletC10 Suburban5.7LV8N/A
1970ChevroletC10 Suburban6.6LV8N/A
1970ChevroletC20 Suburban4.1LL6N/A
1970ChevroletC20 Suburban4.8LL6N/A
1970ChevroletC20 Suburban5.0LV8N/A
1970ChevroletC20 Suburban5.7LV8N/A
1970ChevroletC20 Suburban6.6LV8N/A
1970ChevroletCamaroN/A
1970ChevroletCapriceN/A
1970ChevroletCorvette5.7LV8N/A
1970ChevroletCorvette7.4LV8N/A
1970ChevroletEl CaminoN/A
1970ChevroletImpala7.4LV8N/A
1970ChevroletImpala4.1LL6N/A
1970ChevroletK10 Suburban4.1LL6N/A
1970ChevroletK10 Suburban5.0LV8N/A
1970ChevroletK10 Suburban5.7LV8N/A
1970ChevroletK10 Suburban6.6LV8N/A
1970ChevroletK10 Suburban4.8LL6N/A
1970ChevroletK20 Suburban4.1LL6N/A
1970ChevroletK20 Suburban4.8LL6N/A
1970ChevroletK20 Suburban5.0LV8N/A
1970ChevroletK20 Suburban5.7LV8N/A
1970ChevroletMonte Carlo7.4LV8N/A
1970ChevroletNovaN/A
1970GMCG15/G1500 Van4.1LL6N/A
1970GMCG15/G1500 Van5.0LV8N/A
1970GMCG25/G2500 Van4.1LL6N/A
1970GMCG25/G2500 Van5.0LV8N/A
1970GMCG25/G2500 Van5.7LV8N/A
1970GMCJimmy4.1LL6N/A
1970GMCJimmy4.8LL6N/A
1970GMCJimmy5.0LV8N/A
1970GMCJimmy5.7LV8N/A
1970PontiacBonneville7.5LV8N/Aw/ M38 Trans.
1970PontiacBonneville6.6LV8N/Aw/ M38 Trans.
1970PontiacCatalina5.7LV8N/Aw/ M38 Trans.
1970PontiacCatalina7.5LV8N/Aw/ M38 Trans.
1970PontiacCatalina6.6LV8N/Aw/ M38 Trans.
1970PontiacFirebirdN/A
1970PontiacFirebird6.6LV8N/Aw/ M38 Trans.
1970PontiacGrand Prix6.6LV8N/Aw/ M38 Trans.
1970PontiacGrand Prix7.5LV8N/Aw/ M38 Trans.
1970PontiacGTO6.6LV8N/Aw/ M38 Trans.
1970PontiacGTO7.5LV8N/Aw/ M38 Trans.
1970PontiacLeMans5.7LV8N/A
1970PontiacLeMans4.1LL6N/A
1970PontiacLeMans7.5LV8N/Aw/ M38 Trans.
1970PontiacLeMans6.6LV8N/Aw/ M38 Trans.
1970PontiacTempest4.1LL6N/Aw/ M38 Trans.
1970PontiacTempest6.6LV8N/Aw/ M38 Trans.
1969ChevroletBel AirN/A
1969ChevroletBlazer4.1LL6N/A
1969ChevroletBlazer4.8LL6N/A
1969ChevroletBlazer5.0LV8N/A
1969ChevroletBlazer5.7LV8N/A
1969ChevroletC10 SuburbanN/A
1969ChevroletC20 SuburbanN/A
1969ChevroletCamaroN/A
1969ChevroletCapriceN/A
1969ChevroletCorvetteN/A
1969ChevroletEl CaminoN/A
1969ChevroletImpalaN/A
1969ChevroletK10 Suburban4.1LL6N/A
1969ChevroletK10 Suburban4.8LL6N/A
1969ChevroletK10 Suburban5.0LV8N/A
1969ChevroletK10 Suburban5.7LV8N/A
1969ChevroletK10 Suburban5.3LV8N/A
1969ChevroletK10 Suburban6.5LV8N/A
1969ChevroletK20 Suburban4.1LL6N/A
1969ChevroletK20 Suburban4.8LL6N/A
1969ChevroletK20 Suburban5.0LV8N/A
1969ChevroletK20 Suburban5.7LV8N/A
1969ChevroletK20 Suburban5.3LV8N/A
1969ChevroletK20 Suburban6.5LV8N/A
1969ChevroletNovaN/A
1969GMCG15/G1500 Van3.8LL6N/A
1969GMCG15/G1500 Van4.1LL6N/A
1969GMCG15/G1500 Van5.0LV8N/A
1969GMCG25/G2500 Van3.8LL6N/A
1969GMCG25/G2500 Van4.1LL6N/A
1969GMCG25/G2500 Van5.0LV8N/A
1968ChevroletC10 SuburbanN/A
1968ChevroletC20 Suburban4.1LL6N/A
1968ChevroletC20 Suburban4.8LL6N/A
1968ChevroletC20 Suburban5.0LV8N/A
1968ChevroletC20 Suburban5.3LV8N/A
1968ChevroletC20 Suburban6.5LV8N/A
1968ChevroletCamaroN/A
1968ChevroletCapriceN/A
1968ChevroletEl Camino5.3LV8N/A
1968ChevroletEl Camino5.4LV8N/A
1968ChevroletEl Camino6.5LV8N/A
1968ChevroletEl Camino4.1LL6N/A
1968ChevroletEl Camino3.8LL6N/A
1968ChevroletEl Camino5.0LV8N/A
1968ChevroletEl Camino5.7LV8N/A
1968ChevroletK10 Suburban4.1LL6N/A
1968ChevroletK10 Suburban5.0LV8N/A
1968ChevroletK10 Suburban5.3LV8N/A
1968ChevroletK10 Suburban5.4LV8N/A
1968ChevroletK10 Suburban6.5LV8N/A
1968ChevroletK20 Suburban4.1LL6N/A
1968ChevroletK20 Suburban4.8LL6N/A
1968ChevroletK20 Suburban5.0LV8N/A
1968ChevroletK20 Suburban5.3LV8N/A
1968ChevroletK20 Suburban5.4LV8N/A
1968ChevroletK20 Suburban6.5LV8N/A
1968GMCG15/G1500 Van3.8LL6N/A
1968GMCG15/G1500 Van4.1LL6N/A
1968GMCG15/G1500 Van5.0LV8N/A
1968GMCG25/G2500 Van3.8LL6N/A
1968GMCG25/G2500 Van4.1LL6N/A
1968GMCG25/G2500 Van5.0LV8N/A
1967ChevroletBel AirN/A
1967ChevroletC10 SuburbanN/A
1967ChevroletC20 SuburbanN/A
1967ChevroletCamaroN/A
1967ChevroletCapriceN/A
1967ChevroletCorvetteN/A
1967ChevroletEl CaminoN/A
1967ChevroletImpalaN/A
1967ChevroletImpala7.0LV8N/A
1967ChevroletImpala4.1LL6N/A
1967ChevroletImpala4.6LV8N/A
1967ChevroletImpala5.3LV8N/A
1967ChevroletImpala5.4LV8N/A
1967ChevroletImpala6.5LV8N/A
1967ChevroletK10 Suburban4.1LL6N/A
1967ChevroletK10 Suburban4.8LL6N/A
1967ChevroletK10 Suburban4.6LV8N/A
1967ChevroletK10 Suburban5.3LV8N/A
1967ChevroletK20 Suburban4.1LL6N/A
1967ChevroletK20 Suburban4.8LL6N/A
1967ChevroletK20 Suburban4.6LV8N/A
1967ChevroletK20 Suburban5.3LV8N/A
1967ChevroletMalibuN/A
1967GMCG15/G1500 Van3.8LL6N/A
1967GMCG15/G1500 Van4.1LL6N/A
1967GMCG15/G1500 Van4.6LV8N/A
1967GMCG15/G1500 Van5.4LV8N/A
1967GMCG25/G2500 Van3.8LL6N/A
1967GMCG25/G2500 Van4.1LL6N/A
1967GMCG25/G2500 Van5.4LV8N/A
1967GMCG25/G2500 Van4.6LV8N/A
1966ChevroletBel Air7.0LV8N/Aw/o Stripe
1966ChevroletBel Air5.3LV8N/Aw/o Stripe
1966ChevroletBel Air4.1LL6N/Aw/o Stripe
1966ChevroletBel Air4.6LV8N/Aw/o Stripe
1966ChevroletBel Air6.5LV8N/Aw/o Stripe
1966ChevroletCapriceN/Aw/o Stripe
1966ChevroletCorvetteN/A
1966ChevroletEl CaminoN/A
1966ChevroletEl Camino3.2LL6N/A
1966ChevroletEl Camino3.8LL6N/A
1966ChevroletEl Camino4.6LV8N/A
1966ChevroletEl Camino5.3LV8N/A
1966ChevroletEl Camino6.5LV8N/A
1966ChevroletImpala6.5LV8N/Aw/o Stripe
1966ChevroletImpala7.0LV8N/Aw/o Stripe
1966ChevroletImpala4.1LL6N/Aw/o Stripe
1966ChevroletImpala5.3LV8N/Aw/o Stripe
1966ChevroletImpala5.4LV8N/Aw/o Stripe
1966ChevroletImpala4.6LV8N/Aw/o Stripe
1966ChevroletMalibu4.6LV8N/Aw/o Stripe
1966ChevroletMalibu3.2LL6N/Aw/o Stripe
1966ChevroletMalibu5.3LV8N/Aw/o Stripe
1966ChevroletMalibu6.5LV8N/Aw/o Stripe
1966ChevroletMalibu3.8LL6N/Aw/o Stripe
1966GMCG1000 Series2.5LL4N/A
1966GMCG1000 Series3.2LL6N/A
1966GMCG1000 Series3.8LL6N/A
1965ChevroletBel AirN/A
1965ChevroletCorvetteN/A
1965ChevroletEl Camino4.6LV8N/A2nd Design
1965ChevroletEl Camino5.3LV8N/A2nd Design
1965ChevroletEl Camino3.8LL6N/A2nd Design
1965ChevroletImpalaN/A
1965ChevroletImpala3.8LL6N/A
1965ChevroletImpala4.1LL6N/A
1965ChevroletImpala6.7LV8N/A
1965ChevroletImpala5.3LV8N/A
1965ChevroletImpala5.4LV8N/A
1965ChevroletImpala6.5LV8N/A
1965ChevroletMalibuN/A
1965GMCG1000 Series2.5LL4N/A
1965GMCG1000 Series3.2LL6N/A
1965GMCG1000 Series3.8LL6N/A
1964ChevroletBel Air3.8LL6N/A
1964ChevroletBel Air6.7LV8N/A
1964ChevroletBel Air4.6LV8N/A
1964ChevroletBel Air5.3LV8N/A
1964ChevroletCorvetteN/A
1964ChevroletEl Camino5.3LV8N/A2nd Design
1964ChevroletEl Camino4.6LV8N/A2nd Design
1964ChevroletEl Camino3.8LL6N/A2nd Design
1964ChevroletImpala3.8LL6N/A
1964ChevroletImpala6.7LV8N/A
1964ChevroletImpala4.6LV8N/A
1964ChevroletImpala5.3LV8N/A
1964ChevroletImpala5.4LV8N/A
1964ChevroletMalibu3.2LL6N/A
1964ChevroletMalibu3.8LL6N/A
1964ChevroletMalibu4.6LV8N/A
1964ChevroletMalibu5.3LV8N/A
1964GMCG1000 Series2.5LL4N/A
1964GMCG1000 Series3.2LL6N/A
1964GMCG1000 Series3.8LL6N/A
1964PontiacBonneville6.4LV8N/A
1964PontiacBonneville6.9LV8N/A
1964PontiacCatalina6.4LV8N/A
1964PontiacCatalina6.9LV8N/A
1964PontiacGrand Prix6.4LV8N/A
1964PontiacGrand Prix6.9LV8N/A
1964PontiacGTO6.4LV8N/A
1964PontiacLeMans3.5LL6N/A
1964PontiacLeMans5.3LV8N/A
1964PontiacTempest5.3LV8N/A
1964PontiacTempest3.5LL6N/A
1963ChevroletCorvette5.3LV8N/A
1962ChevroletBel Air5.3LV8N/A
1962ChevroletCorvette5.3LV8N/A
1962ChevroletImpala5.3LV8N/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

35263557-70087R101289057783FM2307MD-33TM15TM474VM115VM615

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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