{"id":29800,"date":"2026-03-01T15:56:32","date_gmt":"2026-03-01T15:56:32","guid":{"rendered":"https:\/\/amgclassicsupply.com\/?post_type=product&p=29800"},"modified":"2026-03-01T15:56:32","modified_gmt":"2026-03-01T15:56:32","slug":"pre-merger-amg-3-4-liter-m104-engine-722-5-5-speed-auto-complete-performance-swap","status":"publish","type":"product","link":"https:\/\/amgclassicsupply.com\/index.php\/product\/pre-merger-amg-3-4-liter-m104-engine-722-5-5-speed-auto-complete-performance-swap\/","title":{"rendered":"Pre-Merger AMG 3.4 Liter M104 Engine & 722.5 5-Speed Auto \u2013 Complete Performance Swap"},"content":{"rendered":"

Offered here is a highly desirable AMG-tuned M104 3.4-liter 24-valve engine paired with the 722.5 5-speed automatic transmission<\/strong>, forming a complete performance drivetrain package from the golden era of independent AMG engineering.<\/p>\n

The Mercedes-Benz M104<\/span><\/span><\/strong> platform is widely regarded as one of Mercedes-Benz\u2019s strongest and most tunable inline-six engines. When enhanced by AMG<\/span><\/span><\/strong>, displacement was increased to 3.4 liters, delivering stronger midrange torque, sharper throttle response, and significantly improved overall performance.<\/p>\n

Paired with the robust Mercedes-Benz 722.5<\/span><\/span><\/strong>, this setup provides both performance and drivability, making it ideal for period-correct AMG builds.<\/p>\n

\n

AMG 3.4 M104 \u2013 Technical Highlights<\/h2>\n
    \n
  • \n

    3.4-liter inline 6-cylinder configuration<\/p>\n<\/li>\n

  • \n

    24-valve DOHC head<\/p>\n<\/li>\n

  • \n

    Increased displacement over standard 3.0L<\/p>\n<\/li>\n

  • \n

    AMG-specific tuning and calibration<\/p>\n<\/li>\n

  • \n

    Strong midrange torque delivery<\/p>\n<\/li>\n

  • \n

    High-revving yet smooth character<\/p>\n<\/li>\n<\/ul>\n

    Power output typically ranged around 270+ horsepower depending on configuration and application.<\/p>\n

    \n

    722.5 Five-Speed Automatic Transmission<\/h2>\n

    The 722.5 transmission adds:<\/p>\n

      \n
    • \n

      Overdrive 5th gear<\/p>\n<\/li>\n

    • \n

      Improved highway cruising efficiency<\/p>\n<\/li>\n

    • \n

      Strong torque handling capability<\/p>\n<\/li>\n

    • \n

      Smooth yet responsive shifting<\/p>\n<\/li>\n<\/ul>\n

      This combination was commonly found in high-performance W124 and W201 AMG builds of the early 1990s.<\/p>\n

      \n

      Perfect For<\/h2>\n
        \n
      • \n

        W124 AMG builds<\/p>\n<\/li>\n

      • \n

        W201 190E 3.4 conversions<\/p>\n<\/li>\n

      • \n

        Period-correct pre-merger restorations<\/p>\n<\/li>\n

      • \n

        Performance-oriented classic Mercedes projects<\/p>\n<\/li>\n

      • \n

        Collectors seeking authentic AMG drivetrain components<\/p>\n<\/li>\n<\/ul>\n

        \n

        Collector & Investment Appeal<\/h2>\n

        Independent-era AMG drivetrains are becoming increasingly rare, especially complete engine + transmission packages.<\/p>\n

        Why this setup is desirable:<\/p>\n

          \n
        • \n

          Authentic AMG displacement upgrade<\/p>\n<\/li>\n

        • \n

          Complete matched drivetrain<\/p>\n<\/li>\n

        • \n

          Period-correct performance configuration<\/p>\n<\/li>\n

        • \n

          Increasing global demand for pre-merger AMG components<\/p>\n<\/li>\n

        • \n

          Strong appreciation potential<\/p>\n<\/li>\n<\/ul>\n

          As pre-merger AMG vehicles rise in value, original AMG engines are becoming centerpiece collector assets.<\/p>\n","protected":false},"excerpt":{"rendered":"

          VIN: WDB1240511B834275
          \nChassis: Parts
          \nTransmission: Automatic
          \nSeller: Private
          \nAMG 3.4L M104
          \nMatching Numbers
          \n268hp \/ 243lb-ft
          \n5-Speed Automatic
          \nGerman-Market
          \n62k Miles<\/p>\n","protected":false},"featured_media":29810,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[80],"product_tag":[],"class_list":{"0":"post-29800","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-engine","8":"first","9":"instock","10":"shipping-taxable","11":"purchasable","12":"product-type-simple"},"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product\/29800","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/comments?post=29800"}],"version-history":[{"count":1,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product\/29800\/revisions"}],"predecessor-version":[{"id":29814,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product\/29800\/revisions\/29814"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/media\/29810"}],"wp:attachment":[{"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/media?parent=29800"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product_brand?post=29800"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product_cat?post=29800"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/amgclassicsupply.com\/index.php\/wp-json\/wp\/v2\/product_tag?post=29800"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}