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

188 topics in this forum

1. Winter fuel for L5P

   By COB II, December 21, 2020
   • 3 replies
   • 5.3k views
   • 
   • u3putt
   • January 8, 2021

3. Air bags

   By inquenciocha, December 28, 2020
   • 3 replies
   • 2.1k views
   • 
   • rblanch
   • January 7, 2021

4. Retractable Tonneau - who has used them in snowy climates?

   By SpeedyD, December 30, 2020
   • 2 replies
   • 1.8k views
   • 
   • redwngr
   • January 6, 2021

5. Dual battery/alternator configuration?

   By Hank B, December 27, 2020
   • 2 replies
   • 4.9k views
   • 
   • Hank B
   • December 28, 2020

6. Extended parking idle power off

   By CoalRoller, November 18, 2020
   • 2 replies
   • 7.7k views
   • 
   • Mi99z71
   • December 27, 2020

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

   By Terra Platt, October 28, 2019   

   • Trans fluid
   • 14 replies
   • 43.2k views
   • 
   • mostcorey95
   • December 13, 2020

8. Break in period 1 2

   By Foldbak, December 6, 2020
   • 15 replies
   • 11.6k views
   • 
   • Grumpy Bear
   • December 13, 2020

9. 2020 GMC 3500 Denali

   By milosusa, November 17, 2020   

   • rear differential
   • 2 replies
   • 4k views
   • 
   • redwngr
   • November 26, 2020

10. Aftermarket exhaust/intake Options 1 2 3

    By Skididdy, September 22, 2020
    • 31 replies
    • 19.4k views
    • 
    • motorsswin
    • November 17, 2020

11. 2021 Diesel break in 1 2 3

    By Bayou Cajun, November 3, 2020
    • 36 replies
    • 22.7k views
    • 
    • Grumpy Bear
    • November 17, 2020

12. DEF Spraying undercarrage

    By Lfod1836, November 1, 2020
    • 1 reply
    • 1.5k views
    • 
    • Keith_Schumaker
    • November 1, 2020

13. Conventional or full synthetic 1 2 3 4 5

    By 07HD, March 24, 2020
    • 72 replies
    • 48.7k views
    • 
    • Charles Ha11
    • October 28, 2020

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

    By combat1500, October 20, 2020
    • 5 replies
    • 10.8k views
    • 
    • Pate Services
    • October 21, 2020

15. My first diesel

    By Danny R. Sucher, October 13, 2020   

    • Oil pressure? Warm up?
    • 5 replies
    • 8.5k views
    • 
    • Danny R. Sucher
    • October 15, 2020

16. Duromax thumping sound

    By William Chapman, March 18, 2020
    • 10 replies
    • 22.7k views
    • 
    • Tomato
    • October 14, 2020

17. PTO Question

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

18. 2500 mods

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

19. Extended warranty

    By shadow gray 2020 hd, September 9, 2020
    • 10 replies
    • 9.8k views
    • 
    • redwngr
    • September 26, 2020

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

    By Peekaboo Bruizer, November 22, 2019
    • 41 replies
    • 23.7k views
    • 
    • Lfod1836
    • September 24, 2020

21. Changing my grill

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

22. New Truck/First Towing Experience

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

23. 2020 2500AT4 with Duramax Max Payload

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

24. OEM Fuel filtration

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

25. 3500 srw differential fluid capacity

    By rblanch, July 26, 2020
    • 13 replies
    • 31.4k views
    • 
    • redwngr
    • July 27, 2020

26. Thinking out loud 1 2

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