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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. 2021 6.6 gas Hollow tapping noise

    By Dusilligaf,
    • 10 replies
    • 678 views

  2. Oil filler extension tube 1 2

    By Randal Scott,
    • 18 replies
    • 1.7k views

  3. Hello from GA.

    By GAMark,
    • 11 replies
    • 629 views

  4. 2021 Chevy Silverado 2500 HD L8T SELF DESTRUCT

    By Tallman3,
    • 6 replies
    • 939 views

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

    By Dr1ft3r,   
    • 107 replies
    • 18.2k views

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

    By Another JR,
    • 0 replies
    • 244 views

  7. 2022 Silverado 2500HD with the dreaded 6 speed shudder 1 2

    By Rogue Leader,
    • 18 replies
    • 3k views

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

    By Jettech1,
    • 70 replies
    • 22.8k views

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

    By Truston Gunter,
    • 329 replies
    • 88.8k views

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

    By Coop8202,   
    • 15 replies
    • 15.6k views

  11. Transmission Oil Cooler Lines - Replacement

    By darleyhavidson,
    • 5 replies
    • 794 views

  12. Normal L8T noises? 1 2 3

    By BuckWallace,
    • 36 replies
    • 12.7k views

  13. Noise while driving

    By sllewm,
    • 6 replies
    • 3.4k views

  14. 6.6 Gasser Longevity 1 2 3

    By MORSNO,
    • 34 replies
    • 10.2k views

  15. GM and Allison Get Back Together

    By Z45,
    • 2 replies
    • 582 views

  16. 10L1000 anyone with High Mileage ? I hate Damocles.... 1 2 3 4 5

    By Homer1959,
    • 66 replies
    • 6.7k views

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

    By dieselfan1,
    • 52 replies
    • 2.4k views

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

    By mrjulian416,
    • 7 replies
    • 1.1k views

  19. 2022 L8T 6.6 Oil Use Calculation (when to worry and when not to)

    By UltimateToolReviews,
    • 6 replies
    • 1k views

  20. Oil Test From Break-In vs 15k

    By stlchevy61,   
    • 4 replies
    • 831 views

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

    By BigAlBuilds,
    • 4 replies
    • 1.7k views

  22. Magnetic oil drain plug

    By dieselfan1,
    • 2 replies
    • 419 views

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

    By dieselfan1,
    • 62 replies
    • 4.4k views

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

    By Homer1959,
    • 28 replies
    • 2.3k views

  25. 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
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