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6.6L Gas V8 (L8T)

The iron-block workhorse. Tech and reliability discussion for the 6.6L L8T V8 and the 6-speed / 10-speed heavy-duty transmissions.

254 topics in this forum

  1. E85 Option

    By C/K Man,
    • 1 reply
    • 2.8k views

  2. E88 fuel

    By SuperDuper,
    • 11 replies
    • 15.9k views

  3. Easy Oil Change

    By Texas Gasser,
    • 6 replies
    • 13.9k views

  4. Edge CTS3

    By Gregg Staples,
    • 8 replies
    • 3.3k views

  5. Engine failure 1 2

    By Tuckertruck,
    • 23 replies
    • 17.3k views

  6. Enjoying the new gasser?

    By Z71RAD88,
    • 12 replies
    • 4.3k views

  7. Factory ordering, any updates?

    By SnowsledBen,
    • 9 replies
    • 3.5k views

  8. Feel Good Story About the L8T Continuing to Run 1 2

    By Another JR,
    • 17 replies
    • 16.6k views

  9. Feel good story about the L8T towing heavy 1 2 3 4

    By mrjulian416,
    • 49 replies
    • 27.3k views

  10. First Oil Change 1 2 3 4

    By texasnavy05,
    • 59 replies
    • 119.9k views

  11. first oil change - 2026 2500HD gas

    By c4racer2,
    • 14 replies
    • 791 views

  12. First Oil Change - What is this?!?!

    By loam_seeker,
    • 3 replies
    • 2.8k views

  13. First tow with Big Red

    By Cheekster96,
    • 4 replies
    • 2.6k views

  14. Fluid Change Questions 1 2

    By Core-Lokt,
    • 21 replies
    • 1.5k views

  15. FUEL GAUGE INACCURATE

    By rickg gmparts,
    • 9 replies
    • 3.5k views

  16. Gas 2500 Resale Value 1 2

    By GMdude2020,
    • 16 replies
    • 13.4k views
    • Mdb
    • Mdb

  17. Gasser 6.6 dual exhaust kit - post it when you find it! 1 2

    By ROOK Lucky 13,
    • 15 replies
    • 8.4k views

  18. Giving the gas motor a shot 1 2

    By CRApex,
    • 24 replies
    • 6.1k views

  19. GM 6L90 and 6L90E Transmission

    By rileyc,
    • 1 reply
    • 14.9k views

  20. GM and Allison Get Back Together

    By Z45,
    • 2 replies
    • 566 views

  21. Gm oil visc recommended for the southern states 1 2

    By Homer1959,
    • 28 replies
    • 2.3k views

  22. GM Truck HD New Engine Next Gen

    By Red Armor Oil,
    • 3 replies
    • 2.4k views

  23. Hello from GA.

    By GAMark,
    • 11 replies
    • 610 views

  24. Here's a great video with the new 10 speed behind the gasser towing a 15k fifth wheel. I'm impressed! 1 2 3

    By Jettech1,
    • 39 replies
    • 7.8k views

  25. Hesitation when accelerating

    By Harv3589,
    • 6 replies
    • 3.6k views

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