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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.

256 topics in this forum

  1. 2020 GMC Sierra

    By Lenny Bonin 1,
    • 1 reply
    • 1.6k views

  2. Payload question

    By Babe,
    • 6 replies
    • 3.5k views

  3. 6.6 mpg out west

    By Remington92,
    • 11 replies
    • 9.3k views

  4. 6.6 Gasser 1 2 3 4 8

    By gearheadesw,
    • 114 replies
    • 44.2k views

  5. Throttle Body - 2020 6.6 Sierra- service bulletin

    By Rewopleahcim,
    • 5 replies
    • 14.2k views

  6. 93 octane gas 1 2

    By texasnavy05,
    • 18 replies
    • 27.4k views
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