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Standard Ignition TM-33 Automatic Transmission Vacuum ModulatorOE Quality 60-Day Returns
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Part #: TM-33

Standard Ignition TM-33 Automatic Transmission Vacuum Modulator

⚙️ 271 vehicles fit this part
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🚗Fitment: Buick, Chevrolet, Oldsmobile, Pontiac, and GMC, Regal, El Camino, Impala, Monte Carlo, Cutlass Supreme, Bonneville, Grand Prix, Parisienne, Electra, LeSabre, Riviera, Camaro, Caprice, Malibu, Grand LeMans, C1500, C1500 Suburban, C2500, C2500 Suburban, Jimmy, K1500 Suburban, Century, Estate Wagon, C10, Custom Cruiser, Cutlass Cruiser, Delta 88, Toronado, Catalina, Firebird, Laurentian, LeMans, C10 Suburban, Corvette, 98, Cutlass, Cutlass Salon, Grand Am, Skylark, Monza, Cutlass Calais, Omega, Starfire, Phoenix, C30, Nova, C15, C15 Suburban, Vega, Astre, Grand Safari, K5 Blazer, Laguna, K25, Sunbird, Apollo, Centurion, Bel Air, and Chevelle
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Overview of Standard Ignition TM-33 Vacuum Modulator

The Standard Ignition TM-33 Automatic Transmission Vacuum Modulator is designed for reliable performance in a range of classic and modern vehicles. Engineered with a durable brass finish and dual hose connectors, this modulator ensures precise vacuum control for automatic transmissions in Buick, Chevrolet, GMC, Oldsmobile, and Pontiac models.

  • Durable brass part finish for corrosion resistance
  • Two hose connectors for secure vacuum line attachment
  • Compatible with multiple GM makes and models including Chevrolet C10, Pontiac Firebird, and Buick LeSabre
  • Part number TM-33 for easy identification and replacement

Product Details and Attributes

The TM-33 vacuum modulator features a brass finish that provides enhanced durability and resistance to wear caused by heat and environmental factors. It includes two hose connectors, allowing for a secure and leak-free connection to the transmission vacuum lines. This component is critical for regulating transmission shift timing and pressure based on engine vacuum, contributing to smooth gear changes and overall transmission performance.

Compatible Vehicles and Fitment

This automatic transmission vacuum modulator is compatible with a wide range of vehicles from Buick, Chevrolet, GMC, Oldsmobile, and Pontiac. Notable compatible models include the Chevrolet C10 and C1500 Suburban, Pontiac Firebird and Grand Prix, Buick LeSabre and Century, as well as the Oldsmobile Cutlass and Delta 88. The TM-33 is suitable for use in both classic and late-model vehicles requiring precise vacuum modulation for automatic transmissions.

Common Applications and Issues Addressed

  • Corrects delayed or harsh transmission shifting
  • Resolves vacuum leaks affecting transmission performance
  • Prevents erratic or slipping gear changes
  • Improves transmission response in Buick, Chevrolet, and Pontiac vehicles
  • Restores proper vacuum signal to the transmission control system

Installation Notes and Tips

When installing the TM-33 vacuum modulator, ensure both hose connectors are securely attached to the corresponding vacuum lines to prevent leaks. Verify compatibility with your vehicle’s transmission system before installation. It is recommended to inspect vacuum hoses for cracks or damage and replace them if necessary to maintain optimal performance. Proper installation will help maintain smooth shifting and transmission longevity.

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM specifications, ensuring reliable fit and function. The TM-33 vacuum modulator undergoes quality control testing to provide consistent performance. Please refer to Standard Ignition’s warranty policy for coverage details on this part number.

BrandStandard Ignition
Part NumberTM-33
Part FinishBrass

This part fits 271 vehicles. Search below:

YearMakeModelLitersCylindersFuel TypePositionNotes
1984BuickRegal5.0LV8N/ACompatible with vehicles equipped with Canada Emissions.
1984ChevroletEl Camino5.0LV8N/A
1984ChevroletImpala5.0LV8N/A
1984ChevroletMonte Carlo5.0LV8N/A
1984OldsmobileCutlass Supreme5.0LV8N/ACompatible with vehicles equipped with Canada Emissions.
1984PontiacBonneville5.0LV8N/ACompatible with vehicles equipped with Canada Emissions.
1984PontiacGrand Prix5.0LV8N/A
1984PontiacParisienne5.0LV8N/A
1983BuickLeSabreN/A
1983BuickRegal5.0LV8N/ACompatible with vehicles equipped with Canada Emissions.
1983BuickRiviera5.7LV8N/ANo Color Mark
1983BuickRiviera5.0LV8N/ANo Color Mark
1983ChevroletCamaro5.0LV8N/A
1983ChevroletCaprice5.0LV8N/A
1983ChevroletEl Camino5.0LV8N/A
1983ChevroletImpala5.0LV8N/A
1983ChevroletMalibu5.0LV8N/A
1983ChevroletMonte Carlo5.0LV8N/A
1983PontiacBonneville5.0LV8N/A
1983PontiacGrand LeMans5.0LV8GASN/A
1983PontiacGrand Prix5.0LV8N/A
1982BuickLeSabreN/A
1982BuickRegal5.0LV8N/A
1982BuickRiviera5.7LV8N/ANo Color Mark
1982BuickRiviera5.0LV8N/ANo Color Mark
1982ChevroletCamaro5.0LV8N/A
1982ChevroletCaprice5.0LV8N/A
1982ChevroletEl Camino5.0LV8N/A
1982ChevroletImpala5.7LV8GASN/A
1982ChevroletImpala5.0LV8N/A
1982ChevroletMalibu5.0LV8N/A
1982ChevroletMonte Carlo5.0LV8N/A
1982GMCC15005.7LV8N/Aw/ 3.73 Axle Ratio
1982GMCC1500 Suburban5.7LV8N/Aw/ 3.73 Axle Ratio
1982GMCC25005.7LV8N/Aw/ 3.73 Axle Ratio
1982GMCC2500 Suburban5.0LV8N/Aw/ 3.73 Axle Ratio
1982GMCC2500 Suburban5.7LV8N/Aw/ 3.73 Axle Ratio
1982GMCJimmy5.7LV8N/Aw/ 3.73 Axle Ratio
1982GMCK1500 Suburban5.7LV8N/Aw/ 3.73 Axle Ratio
1982PontiacGrand LeMans5.0LV8N/A
1982PontiacParisienne5.0LV8N/A
1981BuickCentury5.7LV8N/Aw/ External EGR
1981BuickCentury5.0LV8N/A
1981BuickLeSabre5.7LV8N/Aw/ External EGR; w/ Federal Emissions
1981BuickRegalN/Aw/o Stripe
1981BuickRiviera5.7LV8N/ANo Color Mark
1981BuickRiviera5.0LV8N/ANo Color Mark
1981ChevroletC105.7LV8DIESELN/A
1981ChevroletCamaro5.0LV8N/ACompatible with vehicles equipped with U.S. Emissions for Distributor Ignition Pickup.
1981ChevroletCaprice5.0LV8N/ACompatible with vehicles equipped with U.S. Emissions for Distributor Ignition Pickup.
1981ChevroletCaprice5.7LV8DIESELN/Aw/ External EGR; w/ Calif. Emissions
1981ChevroletEl Camino5.0LV8N/A
1981ChevroletImpala5.7LV8DIESELN/Aw/ External EGR
1981ChevroletImpala5.0LV8N/A
1981ChevroletImpala5.7LV8GASN/A
1981ChevroletMalibu5.0LV8N/A
1981ChevroletMonte Carlo5.0LV8N/A
1981GMCC15005.7LV8N/AFits vehicles equipped with California emissions.
1981GMCC15005.7LV8N/A
1981GMCC1500 Suburban5.7LV8DIESELN/AFits vehicles equipped with California emissions.
1981GMCJimmy5.7LV8N/A
1981OldsmobileCustom Cruiser5.7LV8N/Aw/ External EGR; w/ Calif. Emissions
1981OldsmobileCutlass Cruiser5.7LV8N/Aw/ External EGR; w/ Calif. Emissions
1981OldsmobileCutlass Supreme5.7LV8N/A
1981OldsmobileDelta 885.7LV8N/Aw/ External EGR
1981OldsmobileToronado5.7LV8N/ANo Color Mark
1981OldsmobileToronado5.0LV8N/ANo Color Mark
1981PontiacBonneville5.7LV8N/AFits vehicles equipped with California emissions.
1981PontiacCatalina5.0LV8N/ACompatible with vehicles equipped with Canada Emissions.
1981PontiacCatalina5.7LV8N/A
1981PontiacFirebird5.0LV8N/ACompatible with vehicles equipped with Canada Emissions.
1981PontiacGrand LeMans5.0LV8N/A
1981PontiacLaurentian5.7LV8N/AFits vehicles equipped with California emissions.
1981PontiacLaurentian5.0LV8N/ACompatible with vehicles equipped with Canada Emissions.
1981PontiacLeMans5.0LV8N/ACompatible with vehicles equipped with Canada Emissions.
1981PontiacParisienne5.0LV8N/ACompatible with vehicles equipped with Canada Emissions.
1981PontiacParisienne5.7LV8N/AFits vehicles equipped with California emissions.
1980BuickCentury5.0LV8N/A
1980BuickLeSabre5.7LV8N/A
1980BuickRegal5.0LV8N/A
1980BuickRiviera5.7LV8N/ANo Color Mark
1980BuickRiviera5.0LV8N/ANo Color Mark
1980ChevroletC105.7LV8DIESELN/AFits vehicles equipped with California emissions.
1980ChevroletC10 Suburban5.7LV8DIESELN/A
1980ChevroletCamaro5.0LV8N/A
1980ChevroletCaprice5.7LV8DIESELN/Aw/ External EGR
1980ChevroletCaprice5.0LV8N/A
1980ChevroletCaprice5.7LV8GASN/A
1980ChevroletCorvette5.0LV8N/A
1980ChevroletEl Camino5.0LV8N/A
1980ChevroletImpala5.7LV8GASN/A
1980ChevroletImpala5.0LV8N/A
1980ChevroletImpala5.7LV8DIESELN/A
1980ChevroletMalibu5.0LV8N/A
1980ChevroletMalibu5.7LV8N/A
1980ChevroletMonte Carlo5.0LV8N/A
1980GMCC15005.7LV8DIESELN/A
1980GMCC1500 Suburban5.7LV8DIESELN/A
1980Oldsmobile985.7LV8N/A
1980OldsmobileCustom Cruiser5.7LV8N/A
1980OldsmobileCutlass5.0LV8N/A
1980OldsmobileCutlass Salon5.0LV8N/A
1980OldsmobileCutlass Supreme5.7LV8N/AFits vehicles equipped with California emissions.
1980OldsmobileCutlass Supreme5.0LV8N/A
1980OldsmobileDelta 885.7LV8N/A
1980OldsmobileToronadoN/ANo Color Mark
1980PontiacBonneville5.7LV8N/A
1980PontiacCatalina5.7LV8N/A
1980PontiacCatalina5.0LV8N/A
1980PontiacFirebird5.0LV8N/A
1980PontiacGrand Am5.0LV8N/A
1980PontiacGrand LeMans5.0LV8N/A
1980PontiacGrand Prix5.0LV8N/A
1980PontiacLaurentian5.0LV8N/A
1980PontiacLaurentian5.7LV8N/A
1980PontiacLeMans5.0LV8N/A
1980PontiacParisienne5.7LV8N/A
1980PontiacParisienne5.0LV8N/A
1979BuickCentury5.0LV8N/A
1979BuickLeSabreN/A
1979BuickRegal5.0LV8N/A
1979BuickRiviera5.7LV8N/ANo Color Mark
1979BuickSkylark5.0LV8N/A
1979ChevroletC105.7LV8N/A
1979ChevroletCamaro5.0LV8N/A
1979ChevroletCamaro4.1LL6N/ACompatible with vehicles equipped with Federal Emissions.
1979ChevroletCaprice5.0LV8N/A
1979ChevroletCaprice4.1LL6N/ACompatible with vehicles equipped with Federal Emissions.
1979ChevroletEl Camino5.0LV8N/A
1979ChevroletImpala4.1LL6N/ACompatible with vehicles equipped with Federal Emissions.
1979ChevroletImpala5.0LV8N/A
1979ChevroletMalibu5.0LV8N/A
1979ChevroletMonte Carlo5.0LV8N/A
1979ChevroletMonza5.0LV8N/A
1979GMCC15005.7LV8N/A
1979GMCC1500 Suburban5.7LV8DIESELN/A
1979OldsmobileCutlass5.7LV8N/Aw/ High Altitude Emissions; w/ Federal Emissions
1979OldsmobileCutlass5.0LV8N/A
1979OldsmobileCutlass Calais5.7LV8N/A
1979OldsmobileCutlass Salon5.0LV8N/A
1979OldsmobileCutlass Salon5.7LV8N/Aw/ High Altitude Emissions; w/ Federal Emissions
1979OldsmobileCutlass Supreme5.7LV8N/Aw/ High Altitude Emissions; w/ Federal Emissions
1979OldsmobileCutlass Supreme5.0LV8N/A
1979OldsmobileOmega5.0LV8N/A
1979OldsmobileStarfire5.0LV8N/A
1979OldsmobileToronadoN/ANo Color Mark
1979PontiacFirebird5.0LV8N/A
1979PontiacGrand LeMans5.0LV8N/A
1979PontiacGrand Prix5.0LV8N/A
1979PontiacLeMans5.0LV8N/A
1979PontiacPhoenix5.0LV8N/A
1978BuickCentury5.0LV8N/A
1978BuickLeSabre5.0LV8N/A
1978BuickRegal5.0LV8N/A
1978BuickRiviera6.6LV8N/ANo Color Mark
1978BuickRiviera5.7LV8N/ANo Color Mark
1978BuickSkylark5.0LV8N/A
1978ChevroletC305.7LV8N/A
1978ChevroletCamaro4.1LL6N/ACompatible with vehicles equipped with Federal Emissions.
1978ChevroletCamaro5.0LV8N/A
1978ChevroletCaprice5.0LV8N/A
1978ChevroletCaprice4.1LL6N/ACompatible with vehicles equipped with Federal Emissions.
1978ChevroletEl Camino5.0LV8N/A
1978ChevroletImpala5.0LV8N/A
1978ChevroletImpala4.1LL6N/ACompatible with vehicles equipped with Federal Emissions.
1978ChevroletMalibu5.0LV8N/A
1978ChevroletMonte Carlo5.0LV8N/A
1978ChevroletMonza5.0LV8N/AFits vehicles equipped with California emissions.
1978ChevroletNova5.0LV8N/A
1978ChevroletNova4.1LL6N/ACompatible with vehicles equipped with Federal Emissions.
1978OldsmobileCutlass5.0LV8N/A
1978OldsmobileCutlass Salon5.0LV8N/A
1978OldsmobileCutlass Supreme5.0LV8N/A
1978OldsmobileOmega5.0LV8N/A
1978OldsmobileStarfire5.0LV8N/ACompatible with vehicles equipped with High Altitude Emissions.
1978PontiacFirebird5.0LV8N/A
1978PontiacGrand LeMans5.0LV8N/A
1978PontiacGrand Prix5.0LV8N/A
1978PontiacLeMans5.0LV8N/A
1978PontiacPhoenix5.0LV8N/A
1977BuickLeSabreN/A
1977BuickRiviera6.6LV8N/ANo Color Mark
1977BuickRiviera5.7LV8N/ANo Color Mark
1977BuickSkylarkN/A
1977ChevroletCamaro4.1LL6N/ACompatible with vehicles equipped with Federal Emissions.
1977ChevroletCamaro5.0LV8N/A
1977ChevroletCaprice4.1LL6N/ACompatible with vehicles equipped with Federal Emissions.
1977ChevroletCaprice5.0LV8N/ACompatible with vehicles equipped with Federal Emissions.
1977ChevroletEl Camino5.0LV8N/ACompatible with vehicles equipped with Federal Emissions.
1977ChevroletEl Camino4.1LL6N/ACompatible with vehicles equipped with Federal Emissions.
1977ChevroletImpala5.0LV8N/ACompatible with vehicles equipped with Federal Emissions.
1977ChevroletImpala4.1LL6N/ACompatible with vehicles equipped with Federal Emissions.
1977ChevroletMalibu5.0LV8N/A
1977ChevroletMalibu4.1LL6N/A
1977ChevroletMonte Carlo5.0LV8N/AFits vehicles equipped with California emissions.
1977ChevroletMonza2.3LL4N/A
1977ChevroletMonza5.0LV8N/A
1977ChevroletNova5.0LV8N/ACompatible with vehicles equipped with Federal Emissions.
1977ChevroletNova4.1LL6N/ACompatible with vehicles equipped with Federal Emissions.
1977OldsmobileOmega5.0LV8N/A
1977OldsmobileStarfire2.3LL4N/AFits vehicles equipped with California emissions.
1977PontiacBonneville6.6LV8N/A
1977PontiacCatalina6.6LV8N/A
1977PontiacFirebird5.0LV8N/A
1977PontiacFirebird6.6LV8N/Aw/ 2.41 Axle Ratio
1977PontiacGrand LeMans6.6LV8N/A
1977PontiacGrand LeMans5.0LV8N/A
1977PontiacGrand LeMans5.7LV8N/A
1977PontiacLaurentian5.7LV8N/A
1977PontiacLeMans6.6LV8N/A
1977PontiacLeMans5.0LV8N/A
1977PontiacLeMans5.7LV8N/A
1977PontiacParisienne5.7LV8N/A
1977PontiacPhoenix5.0LV8N/A
1976BuickLeSabreN/A
1976BuickRiviera7.5LV8N/ANo Color Mark
1976BuickSkylarkN/A
1976ChevroletC104.1LL6N/A
1976ChevroletC10 Suburban4.1LL6N/A
1976ChevroletCamaro4.1LL6N/A
1976ChevroletCamaro5.0LV8N/A
1976ChevroletCaprice6.6LV8N/AFits vehicles equipped with California emissions.
1976ChevroletEl Camino4.1LL6N/A
1976ChevroletEl Camino5.0LV8N/A
1976ChevroletK5 Blazer4.1LL6N/A
1976ChevroletMalibu5.0LV8N/A
1976ChevroletMonte Carlo5.0LV8N/A
1976ChevroletMonza2.3LL4N/A
1976ChevroletMonza4.3LV8N/A
1976ChevroletMonza5.0LV8N/A
1976ChevroletNova5.0LV8N/A
1976ChevroletNova4.1LL6N/A
1976GMCJimmy4.1LL6N/A
1976OldsmobileStarfire2.3LL4N/A
1976OldsmobileStarfire3.8LV6N/A
1976PontiacSunbirdN/ANo Color Mark
1975BuickLeSabreN/A
1975BuickRiviera7.5LV8N/ANo Color Mark
1975BuickSkylarkN/A
1975ChevroletCamaro5.7LV8N/A
1975ChevroletCaprice5.7LV8N/A
1975ChevroletEl Camino5.7LV8N/A
1975ChevroletK5 Blazer4.1LL6N/A
1975ChevroletMonza4.3LV8N/A
1975ChevroletNova4.1LL6N/A
1975ChevroletNova4.3LV8N/A
1975ChevroletNova5.7LV8N/A
1974BuickLeSabreN/A
1974BuickRiviera7.5LV8N/ANo Color Mark
1974ChevroletCamaro4.1LL6N/A
1974ChevroletNova4.1LL6N/A
1973BuickLeSabreN/A
1973BuickRegalN/A
1973BuickRiviera7.5LV8N/ANo Color Mark
1973ChevroletBel Air5.7LV8N/A
1973ChevroletBel Air4.1LL6N/A
1973ChevroletCamaro4.1LL6N/A
1973ChevroletCamaro5.7LV8N/A
1973ChevroletCaprice5.7LV8N/A
1973ChevroletCaprice6.6LV8N/A
1973ChevroletCorvette5.7LV8N/A
1973ChevroletEl Camino5.7LV8N/A
1973ChevroletEl Camino4.1LL6N/A
1973ChevroletImpala5.7LV8N/A
1973ChevroletImpala4.1LL6N/A
1973ChevroletImpala6.6LV8N/A
1973ChevroletMalibu5.7LV8N/A
1973ChevroletMalibu4.1LL6N/A
1973ChevroletNova4.1LL6N/A
1973ChevroletNova5.0LV8N/A
1973ChevroletNova5.7LV8N/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:

62597997R100389057794FM2319TM43TM753VM316VM632

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

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