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Engines & Drivetrain

Tech for the 5.3L (L83), 6.2L (L86), and 4.3L V6. Tuning and 6L80 / 8L90 transmission support.

2,727 topics in this forum

  1. 2015 Silverado 5.3 Engine Rebuild

    By rab356,
    • 7 replies
    • 6.4k views

  2. Front and rear differential service maintenance schedule

    By askibum02,
    • 12 replies
    • 37.1k views

  3. 2018 V-6 GDI and fuel pressure sensor

    By Mike red hot silverado,
    • 1 reply
    • 447 views

  4. 2015 8L90 Trans Fluid Temp Sensor & Harness

    By SizzlingSkilletz,   
    • 1 reply
    • 5.8k views

  5. Need Advice on Aftermarket Cam Options 1 2

    By Truckboattruck,
    • 24 replies
    • 4.2k views

  6. Circle D convertor 1 2

    By 6.2Midnight,
    • 15 replies
    • 3.1k views

  7. Leaking valve cover gasket?

    By Gary Shull,
    • 3 replies
    • 11.6k views

  8. Startup Tick

    By gburns,
    • 4 replies
    • 1.3k views

  9. Diablo Sport - increasing trans pressure

    By 14burrito,
    • 4 replies
    • 3.8k views

  10. AFM Federal Class Action Law Suit Filed 2104-2021 GM Engines

    By MilwPaul,
    • 1 reply
    • 4.8k views

  11. Pinging on 87 1 2

    By dvzzz,
    • 19 replies
    • 9.7k views

  12. Blown 6.2 L86

    By Bobby Fields,
    • 7 replies
    • 3.5k views

  13. 2017 silverado 5.3 6L80E

    By Stownse,
    • 7 replies
    • 1.8k views

  14. 84,000 miles and needs a new transmission 1 2 3 4

    By sage55,
    • 48 replies
    • 8.2k views

  15. P0307 and more.

    By Aerovette,
    • 2 replies
    • 2.3k views

  16. High Pressure Fuel Pump

    By nwolfe20,
    • 5 replies
    • 16.3k views

  17. 80k 4.3L Ecotec is blown. $9k Repair bill. Seeking options and advice

    By fireberd350,
    • 5 replies
    • 1.3k views

  18. 6L80E thermostat delete sure-cool cooler kit 1 2 3 4

    By Jdezee,
    • 55 replies
    • 81.3k views

  19. 2018 Sierra 6.2 tough starting

    By Boyd Proctor,
    • 5 replies
    • 1k views

  20. 2017 GMC 6.2 Whipple Supercharged Map sensor Problem

    By Tanner Smith,
    • 10 replies
    • 8.9k views

  21. Hub Assembly Replacement Torque Specifications?

    By BlaineBug,
    • 7 replies
    • 91.3k views

  22. Cord hanging by abs pump

    By Castisos,
    • 5 replies
    • 917 views

  23. Skid plate

    By Jared W,
    • 2 replies
    • 882 views

  24. Extreme negative LTFT's.

    By Bedwards923,
    • 8 replies
    • 14k views

  25. 3.08 to 3.42 regear, tuning question

    By 14burrito,
    • 8 replies
    • 3.1k views

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