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

51 topics in this forum

1. Ticking sound at idle

   By Bones454, Saturday at 02:23 AM
   • 3 replies
   • 125 views
   • 
   • MTU Alum
   • 10 hours ago

3. 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
   • 11 replies
   • 657 views
   • 
   • gSwift
   • Saturday at 12:37 PM

4. 2020 Silverado 2500 DEF usage 1 2

   By gjohnston7, June 3
   • 21 replies
   • 987 views
   • 
   • hotairgypsy
   • Friday at 03:02 AM

5. 2020 2500 vs 3500 hd diesel

   By Akwagon, June 25
   • 4 replies
   • 290 views
   • 
   • jjackkrash
   • June 26

6. 10 speed Allison Transmission 1 2 3

   By Double Dkar, September 1, 2019
   • 31 replies
   • 7,803 views
   • 
   • Montana Skies
   • June 23

7. Regen Mode - Engine "Misfiring?"

   By Tomato, June 22
   • 3 replies
   • 189 views
   • 
   • sdelam
   • June 22

8. Diesel Fuel Additive

   By KKDuramax, June 17
   • 2 replies
   • 299 views
   • 
   • redwngr
   • June 21

9. 20 Duramax MPG.......how are we doing? 1 2

   By Peekaboo Bruizer, November 22, 2019
   • 26 replies
   • 3,703 views
   • 
   • TripDad
   • June 18

10. 2020 2500HD Diesel brake vibrating

    By Prestigeww, June 9
    • 9 replies
    • 365 views
    • 
    • Prestigeww
    • June 12

11. Power tailgate will not close

    By pegasus, June 8
    • 1 reply
    • 244 views
    • 
    • MTU Alum
    • June 8

12. fuel tank Fuel tank

    By JohnL1962, June 7
    • 4 replies
    • 361 views
    • 
    • JohnL1962
    • June 8

13. Changing my grill

    By 2020 DirtyMax, June 5
    • 0 replies
    • 224 views
    • 
    • 2020 DirtyMax
    • June 5

14. 2020 L5P First Oil Change 1 2 3

    By MrGraff, October 16, 2019
    • 34 replies
    • 11,400 views
    • 
    • redwngr
    • May 22

15. Conventional or full synthetic 1 2 3 4 5

    By 07HD, March 24
    • 71 replies
    • 3,089 views
    • 
    • 2500W/T
    • May 21

16. A DEF Product Question 1 2

    By 2500W/T, May 7
    • 19 replies
    • 981 views
    • 
    • FirstAscent
    • May 17

17. Allison transmission fluid

    By Bones454, May 12
    • 2 replies
    • 323 views
    • 
    • newdude
    • May 14

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

    By STRUCTUAL_PE, April 11
    • 7 replies
    • 668 views
    • 
    • ChuckTaylor
    • May 9

19. Towing question? 1 2

    By mbsfgts, September 15, 2019
    • 15 replies
    • 1,925 views
    • 
    • 2500W/T
    • May 8

20. Front license plate

    By Butch59, April 25
    • 4 replies
    • 360 views
    • 
    • redwngr
    • April 27

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

    By MesaRat, March 12
    • 24 replies
    • 1,320 views
    • 
    • MesaRat
    • April 25

22. Duromax thumping sound

    By William Chapman, March 18
    • 7 replies
    • 944 views
    • 
    • XY74
    • April 24

23. 2020 GMC 3500 Denali (6.6) DRW

    By Bigcountry70, April 13
    • 4 replies
    • 611 views
    • 
    • redwngr
    • April 23

24. DEF usage. 6.6 vs 3.0 1 2

    By topgear1224, April 17
    • 18 replies
    • 729 views
    • 
    • topgear1224
    • April 19

25. Parts Issue for a 2019 GMC HD Denali

    By Mike Hiser, April 15
    • 2 replies
    • 358 views
    • 
    • davester
    • April 15

26. Question about new 2500HD Diesel tow capacity

    By fsunole33, April 9
    • 13 replies
    • 761 views
    • 
    • XY74
    • April 15