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

183 topics in this forum

1. Where do I add trans fluid in 2020 2500 hd

   By Terra Platt, October 28, 2019   

   • Trans fluid
   • 14 replies
   • 42.1k views
   • 
   • mostcorey95
   • December 13, 2020

3. Break in period 1 2

   By Foldbak, December 6, 2020
   • 15 replies
   • 11.1k views
   • 
   • Grumpy Bear
   • December 13, 2020

4. 2020 GMC 3500 Denali

   By milosusa, November 17, 2020   

   • rear differential
   • 2 replies
   • 3.9k views
   • 
   • redwngr
   • November 26, 2020

5. Aftermarket exhaust/intake Options 1 2 3

   By Skididdy, September 22, 2020
   • 31 replies
   • 18.4k views
   • 
   • motorsswin
   • November 17, 2020

6. 2021 Diesel break in 1 2 3

   By Bayou Cajun, November 3, 2020
   • 36 replies
   • 22.6k views
   • 
   • Grumpy Bear
   • November 17, 2020

7. DEF Spraying undercarrage

   By Lfod1836, November 1, 2020
   • 1 reply
   • 1.4k views
   • 
   • Keith_Schumaker
   • November 1, 2020

8. Conventional or full synthetic 1 2 3 4 5

   By 07HD, March 24, 2020
   • 72 replies
   • 46.6k views
   • 
   • Charles Ha11
   • October 28, 2020

9. Flapping/rattle/tick? while coming to stop (deceleration).

   By combat1500, October 20, 2020
   • 5 replies
   • 10.5k views
   • 
   • Pate Services
   • October 21, 2020

10. My first diesel

    By Danny R. Sucher, October 13, 2020   

    • Oil pressure? Warm up?
    • 5 replies
    • 8.2k views
    • 
    • Danny R. Sucher
    • October 15, 2020

11. Duromax thumping sound

    By William Chapman, March 18, 2020
    • 10 replies
    • 21.7k views
    • 
    • Tomato
    • October 14, 2020

12. PTO Question

    By HaulinHarv, October 4, 2020
    • 0 replies
    • 2.5k views
    • 
    • HaulinHarv
    • October 4, 2020

13. 2500 mods

    By 1JRB, August 15, 2020
    • 3 replies
    • 2.5k views
    • 
    • Rguerra
    • September 29, 2020

14. Extended warranty

    By shadow gray 2020 hd, September 9, 2020
    • 10 replies
    • 9.4k views
    • 
    • redwngr
    • September 26, 2020

15. 20 Duramax MPG.......how are we doing? 1 2 3

    By Peekaboo Bruizer, November 22, 2019
    • 41 replies
    • 23.3k views
    • 
    • Lfod1836
    • September 24, 2020

16. Changing my grill

    By 2020 DirtyMax, June 5, 2020
    • 1 reply
    • 1.7k views
    • 
    • buelldude
    • September 12, 2020

17. New Truck/First Towing Experience

    By CAMPINGCPL, September 8, 2020
    • 6 replies
    • 2.5k views
    • 
    • CAMPINGCPL
    • September 10, 2020

18. 2020 2500AT4 with Duramax Max Payload

    By Troy Gallagher, August 27, 2020
    • 13 replies
    • 2.9k views
    • 
    • Njmurvin
    • September 1, 2020

19. OEM Fuel filtration

    By Njmurvin, August 6, 2020
    • 3 replies
    • 2.8k views
    • 
    • redwngr
    • August 9, 2020

20. 3500 srw differential fluid capacity

    By rblanch, July 26, 2020
    • 13 replies
    • 30.1k views
    • 
    • redwngr
    • July 27, 2020

21. Thinking out loud 1 2

    By Vincent Vignola, July 21, 2020
    • 17 replies
    • 2.7k views
    • 
    • gearheadesw
    • July 23, 2020

22. Regen Mode - Engine "Misfiring?"

    By Tomato, June 22, 2020
    • 4 replies
    • 5.2k views
    • 
    • MrGraff
    • July 21, 2020

23. 2020 GMC 2500 Standard Bed - Roll Up Cover

    By JShover, July 12, 2020
    • 3 replies
    • 1.5k views
    • 
    • MrGraff
    • July 21, 2020

24. Payload question- long vs short bed

    By doc7string, July 9, 2020
    • 7 replies
    • 2.2k views
    • 
    • samuse
    • July 19, 2020

25. Diesel Fuel Additive

    By KKDuramax, June 17, 2020
    • 4 replies
    • 16.3k views
    • 
    • Colossus
    • July 12, 2020

26. 2020 2500HD Diesel brake vibrating

    By Prestigeww, June 9, 2020
    • 9 replies
    • 6.5k views
    • 
    • Prestigeww
    • June 12, 2020