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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.

584 topics in this forum

  1. Error message

    By meanie13,
    • 0 replies
    • 1.7k views

  2. 2006 LBZ interior swap

    By Platinum LBZ,   
    • 5 replies
    • 28.4k views

  3. Door stuck shut

    By GerardNY,
    • 0 replies
    • 1.8k views

  4. Drivers side blows cold and passenger side blows hot

    By Kaden Holloway,
    • 2 replies
    • 3.7k views

  5. Drivers side blows cold and passenger side blows hot on

    By Kaden Holloway,
    • 1 reply
    • 1.8k views

  6. RCDLR Location 2008 Sierra 2500 HD Duramax Crew Cab

    By Bflann,
    • 2 replies
    • 2.7k views

  7. 2006 2500 Sierra Bose stereo issues

    By Bhmorris,
    • 0 replies
    • 1.6k views

  8. Compatible Allison 1000 transmission years?

    By CByz,   
    • 2 replies
    • 19.6k views

  9. 2003 8.1 liter 2500HD Allison 1000

    By Meldrum88,
    • 3 replies
    • 3.5k views

  10. 2001 8.1 4l80e hard shift? Possible tune

    By The_hoove,
    • 0 replies
    • 2k views

  11. Smoking abs module/pump

    By Ramian17,
    • 0 replies
    • 3.4k views

  12. Rust under the dash

    By Grayson Fenske,
    • 12 replies
    • 2.5k views

  13. 4wd light stays on

    By Ramian17,
    • 0 replies
    • 2.8k views

  14. when to replace glow plugs in my diesel

    By Steve-Maine,
    • 1 reply
    • 2k views

  15. 2006 to 2018 Duramax front bumper conversion

    By dirtytwopalms,   
    • 3 replies
    • 27.5k views

  16. 03 Silverado Duramax Electrical

    By Threeper,
    • 7 replies
    • 2k views

  17. 4x4 won’t disengage and trans seems to be stuck in limp mode

    By Jesse bucholtz,
    • 1 reply
    • 1k views

  18. Transfer case selector switch and control module testing

    By tetonspark,
    • 2 replies
    • 2.8k views

  19. Cab climate controls don't direction air through vents.

    By Nextbook,
    • 6 replies
    • 1.6k views

  20. Power/Heated Driver's seat not working

    By Scott Diekmann,
    • 2 replies
    • 1.9k views

  21. tow/haul problem

    By Connie Darrington,
    • 2 replies
    • 1.5k views

  22. Cost of rebuilt transmission

    By Steve-Maine,
    • 2 replies
    • 12.7k views

  23. Will a 2010 gmc 1500 grille fit a 2500hd

    By Wyatt Wood,
    • 0 replies
    • 4.2k views

  24. 2008 single wheel taillights

    By da Co,
    • 2 replies
    • 1.2k views

  25. 2006 Silverado voltage fluctuation

    By Collins803,
    • 0 replies
    • 1.3k views
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