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6.6L Gas V8 & HD Transmission Powertrain (L8T/MYD)

Technical powertrain discussion specifically for the 2020+ L8T 6.6L Gas V8 engine and MYD 6-Speed HD transmission combination on the 2020 Chevrolet Silverado 2500 / 3500 or 2020 GMC Sierra 2500 / 3500

159 topics in this forum

  1. Add engine oil!!! 1 2 3 4 16

    By Truston Gunter,
    • 237 replies
    • 44.5k views

  3. 6.6 6spd towing..some real world data.

    By TeamSaris,
    • 4 replies
    • 292 views

  4. scan gauge 3

    By Gregg Staples,
    • 14 replies
    • 352 views

  5. 2023 6.6L gas single exit black tip cat back system

    By reb0957,
    • 13 replies
    • 2.5k views

  6. 6.6L gasser MPG with new 10 speed Allison tranmission? 1 2 3

    By campah,
    • 38 replies
    • 4.7k views

  7. 2020 2500Hd feels like it is surging when towing a hill 1 2

    By Addison Reeder IV,
    • 21 replies
    • 9.6k views

  8. Normal L8T noises?

    By BuckWallace,
    • 5 replies
    • 830 views

  9. My truck is leaking oil

    By finn5033,
    • 4 replies
    • 3.9k views

  10. 2024 Transfer Case Seal Leak

    By Tater86,
    • 3 replies
    • 456 views

  11. Squeak/squeal when shifting?

    By BuckWallace,
    • 10 replies
    • 1.2k views

  12. 10 Speed Allison vs 6 Speed MPG 1 2

    By mtbadbob,
    • 16 replies
    • 1.3k views

  13. Easy Oil Change

    By Texas Gasser,
    • 6 replies
    • 785 views

  14. Cameras and trailering app help

    By Tfkkolar,
    • 1 reply
    • 796 views

  15. Transmission slips when offroad

    By Cindy Wood,
    • 9 replies
    • 823 views

  16. 2020 Silverado 2500 HD

    By Trey249,
    • 0 replies
    • 488 views

  17. Edge CTS3

    By Gregg Staples,
    • 8 replies
    • 654 views

  18. Camper towing report after 3200 miles 1 2 3

    By UWSkier,
    • 31 replies
    • 3.9k views

  19. 6.6L gas, will it disappoint?? 1 2

    By kylant,
    • 25 replies
    • 3.2k views

  20. 2024 2500 transmission leak 1 2

    By stympyctlan,
    • 29 replies
    • 5.5k views

  21. To Dipstick or NOT To Dipstick The 6 Speed Trans

    By SoCal Angler,
    • 6 replies
    • 1.2k views

  22. E85 Option

    By C/K Man,
    • 1 reply
    • 774 views

  23. MPG at 600 miles

    By 2021 HD,
    • 9 replies
    • 1.5k views

  24. Mobil 1 - Which Flavor for Towing...ESP, Truck/SUV, AFS?

    By SoCal Angler,
    • 10 replies
    • 1.5k views

  25. Perhaps I have missed this in prior conversations concerning the 10 speed behind the gasser. 1 2

    By Jettech1,
    • 23 replies
    • 4.3k views

  26. Are the 6.6 l8t engines inherently noisy? 1 2 3

    By DuckBoi,
    • 30 replies
    • 4.9k views


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