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2000-2014 Silverado HD & Sierra HD

The workhorses. Discussion for the 2500HD and 3500HD heavy-duty trucks. Covers the 2014 HD transition year.


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  1. Duramax Diesel & 8.1L Big Block

    The torque monsters. Tech for the LB7, LLY, LBZ, LMM, LML Duramax engines and the 8.1L Vortec (L18). Covers the Allison 1000 transmission.

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14,430 topics in this forum

  1. 6.0 vs 8.1 1 2

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  2. 15/40... 15/50 ? 1 2

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  3. New to towing. 1 2

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  4. easy mpg improvements? 1 2

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  5. Fuel Tank Capacity 1 2

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  6. Dual Battery Check 1 2

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  7. Tuning? 1 2

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  8. Looking at 2002 Avy with over 200k miles 1 2

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  9. Bad Miss and CEL at Idle 1 2

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