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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.

585 topics in this forum

  1. My First Project and GMC has me stumped

    By whenindoubtuseahammer,
    • 9 replies
    • 182 views

  2. Parts ID Please.

    By SeniorTIKI,
    • 2 replies
    • 582 views

  3. 2006 GMC 2500HD Hitching hot wire to center terminal in trailer wiring connecter

    By Steve-Maine,
    • 1 reply
    • 723 views

  4. Issue 2003 Gmc Sierra 2500hd 4x4 6 inch Cognito lift issues

    By Marshall Pay,   
    • 0 replies
    • 503 views

  5. G80 locker 2004 2500hd

    By Catmanchris,
    • 2 replies
    • 702 views

  6. Airbag sensor location

    By mrzj188,
    • 2 replies
    • 1.1k views

  7. Adventures in Bearing Replacement

    By brainpause,
    • 2 replies
    • 1.4k views

  8. TPMS

    By drivers2214,
    • 1 reply
    • 1.1k views

  9. Transfer case encoder motor help

    By Paul Cords,
    • 1 reply
    • 846 views

  10. warning water in full filter light

    By Steve-Maine,
    • 0 replies
    • 743 views

  11. 4l80e locks rear tires

    By Tylor Ingalls,
    • 1 reply
    • 717 views

  12. 2003 Gmc Sierra 4x4 indicator lights

    By Marshall Pay,
    • 0 replies
    • 644 views

  13. 06 Dura Max oil pan

    By Steve-Maine,
    • 0 replies
    • 800 views

  14. Ruthenium plugs part numbers

    By Leo Opalewski,
    • 1 reply
    • 1.5k views

  15. 2002 2500hd Radio Replacement

    By James Colgrave,
    • 3 replies
    • 2.6k views

  16. 02 GMC 2500hd diff bracket Bushings

    By Brandon18,
    • 7 replies
    • 7.6k views

  17. The *thunk* when stopping

    By Laurence,
    • 4 replies
    • 2.6k views

  18. 4l80e on 2500hd Transmission keep on Overheating

    By Carlos2500,
    • 1 reply
    • 2.8k views

  19. Replacing diesel fuel lines on 06 250HD

    By Steve-Maine,
    • 2 replies
    • 3.7k views

  20. Bed interchange

    By Czman71,
    • 1 reply
    • 1.8k views

  21. 2003 Gmc Sierra 2500hd 6.0L 9.6 mpg slight stutter at idle

    By Marshall Pay,
    • 2 replies
    • 2.8k views

  22. GM 20970876 Parking Brake Control Module Assembly Obsolescence

    By bsjunkin,
    • 4 replies
    • 4.9k views

  23. Chev

    By Jabez chaulk,
    • 0 replies
    • 2.1k views

  24. Heat & defrost issues

    By millerspencer,
    • 2 replies
    • 2.3k views

  25. Slow speed braking vibration

    By Joseph Dutton,
    • 0 replies
    • 2.7k views
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