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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. 6.6 mpg out west

    By Remington92,
    • 11 replies
    • 9.3k views

  2. 6.6 Gasser 1 2 3 4 8

    By gearheadesw,
    • 114 replies
    • 43.9k views

  3. Throttle Body - 2020 6.6 Sierra- service bulletin

    By Rewopleahcim,
    • 5 replies
    • 14k views

  4. 93 octane gas 1 2

    By texasnavy05,
    • 18 replies
    • 27k views
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