6.6L Duramax Diesel & Allison Powertrain (L5P/MGM)

147 topics in this forum

1. diesel fuel additives

   By tc64, September 16, 2020
   • 7 replies
   • 6.2k views
   • 
   • Rguerra
   • September 29, 2020

3. Extended warranty

   By shadow gray 2020 hd, September 9, 2020
   • 10 replies
   • 6.1k views
   • 
   • redwngr
   • September 26, 2020

4. 20 Duramax MPG.......how are we doing? 1 2 3

   By Peekaboo Bruizer, November 22, 2019
   • 41 replies
   • 18.7k views
   • 
   • Lfod1836
   • September 24, 2020

5. Changing my grill

   By 2020 DirtyMax, June 5, 2020
   • 1 reply
   • 1.5k views
   • 
   • buelldude
   • September 12, 2020

6. New Truck/First Towing Experience

   By CAMPINGCPL, September 8, 2020
   • 6 replies
   • 2.1k views
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   • CAMPINGCPL
   • September 10, 2020

7. 2020 2500AT4 with Duramax Max Payload

   By Troy Gallagher, August 27, 2020
   • 13 replies
   • 2.6k views
   • 
   • Njmurvin
   • September 1, 2020

8. OEM Fuel filtration

   By Njmurvin, August 6, 2020
   • 3 replies
   • 1.7k views
   • 
   • redwngr
   • August 9, 2020

9. 3500 srw differential fluid capacity

   By rblanch, July 26, 2020
   • 13 replies
   • 17.3k views
   • 
   • redwngr
   • July 27, 2020

10. Thinking out loud 1 2

    By Vincent Vignola, July 21, 2020
    • 17 replies
    • 2.2k views
    • 
    • gearheadesw
    • July 23, 2020

11. Regen Mode - Engine "Misfiring?"

    By Tomato, June 22, 2020
    • 4 replies
    • 3.6k views
    • 
    • MrGraff
    • July 21, 2020

12. 2020 GMC 2500 Standard Bed - Roll Up Cover

    By JShover, July 12, 2020
    • 3 replies
    • 1.3k views
    • 
    • MrGraff
    • July 21, 2020

13. Payload question- long vs short bed

    By doc7string, July 9, 2020
    • 7 replies
    • 1.7k views
    • 
    • samuse
    • July 19, 2020

14. Diesel Fuel Additive

    By KKDuramax, June 17, 2020
    • 4 replies
    • 12k views
    • 
    • Colossus
    • July 12, 2020

15. 2020 2500HD Diesel brake vibrating

    By Prestigeww, June 9, 2020
    • 9 replies
    • 4.1k views
    • 
    • Prestigeww
    • June 12, 2020

16. Power tailgate will not close

    By pegasus, June 8, 2020
    • 1 reply
    • 1.2k views
    • 
    • MTU Alum
    • June 8, 2020

17. fuel tank Fuel tank

    By JohnL1962, June 7, 2020
    • 4 replies
    • 1.6k views
    • 
    • JohnL1962
    • June 8, 2020

18. 2020 L5P First Oil Change 1 2 3

    By MrGraff, October 16, 2019
    • 34 replies
    • 54.6k views
    • 
    • redwngr
    • May 22, 2020

19. A DEF Product Question 1 2

    By 2500W/T, May 7, 2020
    • 19 replies
    • 5.9k views
    • 
    • FirstAscent
    • May 17, 2020

20. Fender Flare with reflector/light for Silverado 2500?

    By STRUCTUAL_PE, April 11, 2020
    • 7 replies
    • 2.6k views
    • 
    • ChuckTaylor
    • May 9, 2020

21. Towing question? 1 2

    By mbsfgts, September 15, 2019
    • 15 replies
    • 6.5k views
    • 
    • 2500W/T
    • May 8, 2020

22. Front license plate

    By Butch59, April 25, 2020
    • 4 replies
    • 1.5k views
    • 
    • redwngr
    • April 27, 2020

23. Input - HD front springs and Z71 Pkg. 1 2

    By MesaRat, March 12, 2020
    • 24 replies
    • 3.7k views
    • 
    • MesaRat
    • April 25, 2020

24. 2020 GMC 3500 Denali (6.6) DRW

    By Bigcountry70, April 13, 2020
    • 4 replies
    • 1.3k views
    • 
    • redwngr
    • April 23, 2020

25. DEF usage. 6.6 vs 3.0 1 2

    By topgear1224, April 17, 2020
    • 18 replies
    • 13.3k views
    • 
    • topgear1224
    • April 19, 2020

26. Parts Issue for a 2019 GMC HD Denali

    By Mike Hiser, April 15, 2020
    • 2 replies
    • 1.2k views
    • 
    • davester
    • April 15, 2020