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

147 topics in this forum

1. Barney

   By Barney, February 10, 2021
   • 0 replies
   • 207 views
   • 
   • Barney
   • February 10, 2021

3. High Idle

   By gSwift, July 13, 2020
   • 13 replies
   • 46.3k views
   • 
   • leverett.scott
   • February 7, 2021

4. Leaking Diesel Fuel when topping off the tank

   By Rguerra, December 1, 2020
   • 11 replies
   • 7.3k views
   • 
   • Rguerra
   • January 28, 2021

5. 2020 GMC 3500 SINGLE AXLE AT4 CREW 1 2

   By jojo ma, May 31, 2020   

   • AT4
   • 3500
   • (and 2 more)

     Tagged with:

     • AT4
     • 3500
     • BATTERY
     • adaptive cruise control
   • 16 replies
   • 9.3k views
   • 
   • rauan
   • January 27, 2021

6. Engine operating temp

   By Jfg1300, December 21, 2020
   • 7 replies
   • 2.2k views
   • 
   • Keith_Schumaker
   • January 24, 2021

7. Silverado 2500HD Issue

   By TFern, December 18, 2020
   • 11 replies
   • 3.5k views
   • 
   • u3putt
   • January 15, 2021

8. Auto Grade Brake 1 2

   By JRSPerf., November 14, 2020
   • 18 replies
   • 3.4k views
   • 
   • CAMPINGCPL
   • January 14, 2021

9. Winter fuel for L5P

   By COB II, December 21, 2020
   • 3 replies
   • 3.6k views
   • 
   • u3putt
   • January 8, 2021

10. Air bags

    By inquenciocha, December 28, 2020
    • 3 replies
    • 1.5k views
    • 
    • rblanch
    • January 7, 2021

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

    By SpeedyD, December 30, 2020
    • 2 replies
    • 1.5k views
    • 
    • redwngr
    • January 6, 2021

12. Dual battery/alternator configuration?

    By Hank B, December 27, 2020
    • 2 replies
    • 2.5k views
    • 
    • Hank B
    • December 28, 2020

13. Extended parking idle power off

    By CoalRoller, November 18, 2020
    • 2 replies
    • 6.3k views
    • 
    • Mi99z71
    • December 27, 2020

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

    By Terra Platt, October 28, 2019   

    • Trans fluid
    • 14 replies
    • 29.3k views
    • 
    • mostcorey95
    • December 13, 2020

15. Break in period 1 2

    By Foldbak, December 6, 2020
    • 15 replies
    • 7.5k views
    • 
    • Grumpy Bear
    • December 13, 2020

16. 2020 GMC 3500 Denali

    By milosusa, November 17, 2020   

    • rear differential
    • 2 replies
    • 1.8k views
    • 
    • redwngr
    • November 26, 2020

17. Aftermarket exhaust/intake Options 1 2 3

    By Skididdy, September 22, 2020
    • 31 replies
    • 12.9k views
    • 
    • motorsswin
    • November 17, 2020

18. 2021 Diesel break in 1 2 3

    By Bayou Cajun, November 3, 2020
    • 36 replies
    • 19.4k views
    • 
    • Grumpy Bear
    • November 17, 2020

19. DEF Spraying undercarrage

    By Lfod1836, November 1, 2020
    • 1 reply
    • 1.2k views
    • 
    • Keith_Schumaker
    • November 1, 2020

20. Conventional or full synthetic 1 2 3 4 5

    By 07HD, March 24, 2020
    • 72 replies
    • 29.9k views
    • 
    • Charles Ha11
    • October 28, 2020

21. Ticking sound at idle

    By Bones454, July 4, 2020
    • 7 replies
    • 5k views
    • 
    • Charles Ha11
    • October 28, 2020

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

    By combat1500, October 20, 2020
    • 5 replies
    • 6.2k views
    • 
    • Pate Services
    • October 21, 2020

23. My first diesel

    By Danny R. Sucher, October 13, 2020   

    • Oil pressure? Warm up?
    • 5 replies
    • 4.7k views
    • 
    • Danny R. Sucher
    • October 15, 2020

24. Duromax thumping sound

    By William Chapman, March 18, 2020
    • 10 replies
    • 14.5k views
    • 
    • Tomato
    • October 14, 2020

25. PTO Question

    By HaulinHarv, October 4, 2020
    • 0 replies
    • 1.6k views
    • 
    • HaulinHarv
    • October 4, 2020

26. 2500 mods

    By 1JRB, August 15, 2020
    • 3 replies
    • 2.1k views
    • 
    • Rguerra
    • September 29, 2020