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

68 topics in this forum

1. 2500 mods

   By 1JRB, August 15
   • 3 replies
   • 468 views
   • 
   • Rguerra
   • 10 hours ago

3. Exhaust brake or lack there of... need others opinion on this?

   By firedab, March 11
   • 5 replies
   • 1,151 views
   • 
   • Rguerra
   • 11 hours ago

4. diesel fuel additives

   By tc64, September 16
   • 7 replies
   • 306 views
   • 
   • Rguerra
   • 11 hours ago

5. Aftermarket exhaust/intake Options 1 2

   By Skididdy, September 22
   • 18 replies
   • 526 views
   • 
   • MrGraff
   • 22 hours ago

6. 2020 GMC AT4 Garbage Brakes!

   By SVAT4, Monday at 06:33 PM
   • 1 reply
   • 103 views
   • 
   • Tomato
   • Monday at 08:25 PM

7. Extended warranty

   By shadow gray 2020 hd, September 9
   • 10 replies
   • 504 views
   • 
   • redwngr
   • Saturday at 03:20 AM

8. 2020 Silverado 2500 DEF usage 1 2 3 4

   By gjohnston7, June 3
   • 49 replies
   • 4,113 views
   • 
   • Jeepvkng1
   • Friday at 05:23 PM

9. Killing a Duramax

   By 2500W/T, July 30
   • 13 replies
   • 994 views
   • 
   • Lfod1836
   • Thursday at 09:15 PM

10. What did you pay for your 2020 truck 1 2

    By Ronnell Roegner, July 11
    • 17 replies
    • 1,742 views
    • 
    • Lfod1836
    • Thursday at 03:22 PM

11. 20 Duramax MPG.......how are we doing? 1 2 3

    By Peekaboo Bruizer, November 22, 2019
    • 41 replies
    • 6,544 views
    • 
    • Lfod1836
    • Thursday at 03:09 PM

12. Ticking sound at idle

    By Bones454, July 4
    • 6 replies
    • 822 views
    • 
    • redwngr
    • September 17

13. High Idle

    By gSwift, July 13
    • 11 replies
    • 755 views
    • 
    • Colossus
    • September 13

14. Changing my grill

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

15. Regen?

    By Njmurvin, September 9
    • 5 replies
    • 289 views
    • 
    • Colossus
    • September 12

16. New Truck/First Towing Experience

    By CAMPINGCPL, September 8
    • 6 replies
    • 414 views
    • 
    • CAMPINGCPL
    • September 10

17. Duromax thumping sound

    By William Chapman, March 18
    • 8 replies
    • 1,593 views
    • 
    • buelldude
    • September 3

18. 2020 2500AT4 with Duramax Max Payload

    By Troy Gallagher, August 27
    • 13 replies
    • 631 views
    • 
    • Njmurvin
    • September 1

19. OEM Fuel filtration

    By Njmurvin, August 6
    • 3 replies
    • 403 views
    • 
    • redwngr
    • August 9

20. 2020 2500 vs 3500 hd diesel 1 2

    By Akwagon, June 25
    • 23 replies
    • 2,103 views
    • 
    • kylant
    • August 1

21. 3500 srw differential fluid capacity

    By rblanch, July 26
    • 13 replies
    • 477 views
    • 
    • redwngr
    • July 27

22. Thinking out loud 1 2

    By Vincent Vignola, July 21
    • 17 replies
    • 900 views
    • 
    • gearheadesw
    • July 23

23. High RPMs downhill

    By JHarris32, July 22
    • 1 reply
    • 302 views
    • 
    • redwngr
    • July 22

24. 10 speed Allison Transmission 1 2 3

    By Double Dkar, September 1, 2019
    • 36 replies
    • 11,271 views
    • 
    • Girthyhawg
    • July 22

25. 2020 GMC 3500 SINGLE AXLE AT4 CREW

    By jojo ma, May 31   

    • AT4
    • 3500
    • (and 2 more)

      Tagged with:

      • AT4
      • 3500
      • BATTERY
      • adaptive cruise control
    • 12 replies
    • 1,222 views
    • 
    • jojo ma
    • July 21

26. Regen Mode - Engine "Misfiring?"

    By Tomato, June 22
    • 4 replies
    • 523 views
    • 
    • MrGraff
    • July 21