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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. Hello from GA.

    By GAMark,
    • 11 replies
    • 605 views

  2. 2021 Chevy Silverado 2500 HD L8T SELF DESTRUCT

    By Tallman3,
    • 6 replies
    • 872 views

  3. WDH or not on 1-Ton Trucks 1 2 3 4 8

    By Dr1ft3r,   
    • 107 replies
    • 18k views

  4. Current Part Number for 153F Transmission Cooler Bypass Valve for 6L90

    By Another JR,
    • 0 replies
    • 237 views

  5. 2022 Silverado 2500HD with the dreaded 6 speed shudder 1 2

    By Rogue Leader,
    • 18 replies
    • 2.8k views

  6. Cold start one second long awful engine sound 1 2 3 4 5

    By Jettech1,
    • 70 replies
    • 22.7k views

  7. Add engine oil!!! 1 2 3 4 22

    By Truston Gunter,
    • 329 replies
    • 88.3k views

  8. 6.6L Gas Transmissions: 6l90 vs. 10L1000 1 2

    By Coop8202,   
    • 15 replies
    • 15.3k views

  9. Transmission Oil Cooler Lines - Replacement

    By darleyhavidson,
    • 5 replies
    • 744 views

  10. Normal L8T noises? 1 2 3

    By BuckWallace,
    • 36 replies
    • 12.6k views

  11. Noise while driving

    By sllewm,
    • 6 replies
    • 3.4k views

  12. 6.6 Gasser Longevity 1 2 3

    By MORSNO,
    • 34 replies
    • 9.9k views

  13. GM and Allison Get Back Together

    By Z45,
    • 2 replies
    • 561 views

  14. 10L1000 anyone with High Mileage ? I hate Damocles.... 1 2 3 4 5

    By Homer1959,
    • 66 replies
    • 6.5k views

  15. Driving in a blizzard last night 1 2 3 4

    By dieselfan1,
    • 52 replies
    • 2.3k views

  16. How low can you go? T-stats that is..

    By mrjulian416,
    • 7 replies
    • 1k views

  17. 2022 L8T 6.6 Oil Use Calculation (when to worry and when not to)

    By UltimateToolReviews,
    • 6 replies
    • 969 views

  18. Oil Test From Break-In vs 15k

    By stlchevy61,   
    • 4 replies
    • 820 views

  19. Solved! 'ish' Coolant Leak + Possible Engine Replacement

    By BigAlBuilds,
    • 4 replies
    • 1.7k views

  20. Magnetic oil drain plug

    By dieselfan1,
    • 2 replies
    • 415 views

  21. I don't want an oil burner/best oil to use 1 2 3 4 5

    By dieselfan1,
    • 62 replies
    • 4.3k views

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

    By Homer1959,
    • 28 replies
    • 2.2k views

  23. Anyone got a part # for a Twist Lock oil fill doohickey for the oil fill neck? 1 2

    By No F-bdy Bs,
    • 16 replies
    • 2.7k views

  24. New 2025 HD gas 300 miles needs VALVE BODY 1 2

    By dddavel,
    • 18 replies
    • 5.4k views

  25. So how many miles are we seeing out of the L8T/6L90 Powertrain?

    By UltimateToolReviews,
    • 2 replies
    • 1.5k views

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