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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.

257 topics in this forum

  1. 2500HD gas mileage 1 2 3 4

    By BrianB65,
    • 57 replies
    • 48.1k views

  2. First tow with Big Red

    By Cheekster96,
    • 4 replies
    • 2.6k views

  3. 7-Pin Towing Receptacle With Camera Input

    By Juan Parra,   
    • 2 replies
    • 5.4k views

  4. Discount on 2022?

    By Hoginedgewood,
    • 4 replies
    • 1.8k views

  5. Pro-trailering Camera Issues

    By 1MOGAN,
    • 1 reply
    • 1.1k views

  6. 2022 gas deliveries HD from Canada

    By Richard Meyers,
    • 1 reply
    • 1.3k views

  7. Dealers in TX

    By Thumper7,
    • 2 replies
    • 1.2k views

  8. OH Camperpuller

    By OH Camperpuller,
    • 4 replies
    • 1.9k views

  9. Drivability Question

    By nocturnalmotors,
    • 6 replies
    • 2.3k views

  10. Breather Hose Location

    By nocturnalmotors,
    • 6 replies
    • 1.7k views

  11. Towing with 6.6 Gas 2022 GMC 2500 AT4

    By GovernmentMotorsFan,
    • 4 replies
    • 10k views

  12. Lower Gears for Better Towing 1 2

    By Rabbittown,
    • 19 replies
    • 11.4k views

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

    By Another JR,
    • 17 replies
    • 17k views

  14. New to the forum, anyone else have this issue?

    By Cross88,
    • 6 replies
    • 5.5k views

  15. 6.6 gas engine premium fuel?

    By HP4,
    • 13 replies
    • 32.3k views

  16. What did you choose your gas gm 2500 over and why 1 2

    By CaptainMorganNC,
    • 21 replies
    • 20k views
    • HP4
    • HP4

  17. L8T twin turbo -Scoggin Dickey build 2000HP-

    By Big_D,
    • 8 replies
    • 10.5k views

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

    By mrjulian416,
    • 49 replies
    • 27.8k views

  19. Liking the 6.6 gas 1 2 3 4 10

    By Carolina,
    • 140 replies
    • 100.2k views

  20. 2020 GMC 2500 HD--Wheels and Tires--OPINIONS WANTED

    By Swafford09,
    • 5 replies
    • 3.6k views

  21. 21 Silverado 2500 HD Custom

    By Trey Eckert,
    • 1 reply
    • 1.8k views

  22. Larger tires on 6.6 gas

    By 2011Chevy,   
    • 11 replies
    • 15.1k views

  23. Dual Battrey/Dual Alternators

    By hdhp,
    • 5 replies
    • 11.9k views

  24. 6.6 Chirp

    By jsward12,
    • 7 replies
    • 6.1k views

  25. 2020 2500 transmission slipping

    By Blac,
    • 9 replies
    • 10.6k views
    • ug87
    • ug87
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