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

116 topics in this forum

1. What did you pay for your 2020 truck 1 2 3

   By Ronnell Roegner, July 11, 2020
   • 43 replies
   • 13.6k views
   • 
   • yaswanth reddy
   • September 7

3. Service Mode

   By ekbruster, September 4
   • 1 reply
   • 324 views
   • 
   • newdude
   • September 4

4. Need Deleted L5P Advice 1 2

   By Brozat4, January 30
   • 19 replies
   • 5.6k views
   • 
   • Brozat4
   • September 2

5. 10L1000 Trans Fluid Filter

   By 2500W/T, August 31
   • 2 replies
   • 319 views
   • 
   • 2500W/T
   • September 2

6. 2020 2500 vs 3500 hd diesel 1 2

   By Akwagon, June 25, 2020
   • 28 replies
   • 5.7k views
   • 
   • 2500W/T
   • September 2

7. 2020 Silverado 2500 DEF usage 1 2 3 4 5

   By gjohnston7, June 3, 2020
   • 73 replies
   • 29.2k views
   • 
   • 2500W/T
   • September 1

8. looking for engine oil add trick

   By iflypigs, July 16
   • 8 replies
   • 1.1k views
   • 
   • dgstarr63
   • August 31

9. fifth wheel hitch

   By Mardo, March 13
   • 12 replies
   • 2.6k views
   • 
   • 2500W/T
   • August 30

10. Transfer case leak 3274 miles

    By Bones454, August 23
    • 4 replies
    • 421 views
    • 
    • Bones454
    • August 30

11. Questions for a Diesel Tuner

    By 2500W/T, August 23
    • 0 replies
    • 266 views
    • 
    • 2500W/T
    • August 23

12. Terrible highway pulling power

    By Trent Gonzalez, June 9
    • 7 replies
    • 1.9k views
    • 
    • Jrscrib
    • August 22

13. Newbie looking for info.

    By Sumrtime, August 13
    • 1 reply
    • 428 views
    • 
    • XY74
    • August 14

14. 2021 2500 AT4 payload

    By Mardo, March 11
    • 8 replies
    • 2.3k views
    • 
    • redwngr
    • August 11

15. ibanks 1.8

    By Laidback, July 29
    • 3 replies
    • 589 views
    • 
    • Random
    • August 10

16. OEM Steel Rim Size

    By 2500W/T, July 24
    • 3 replies
    • 439 views
    • 
    • 2500W/T
    • August 2

17. Oem 5th wheel puck system

    By Eric Griem, July 12
    • 2 replies
    • 836 views
    • 
    • 2500W/T
    • July 30

18. 35'S ON 2020 2500

    By scoott, June 16
    • 2 replies
    • 986 views
    • 
    • kylant
    • July 24

19. 2020 6.6 D-max towing MPG 1 2 3

    By Lfod1836, December 4, 2019
    • 31 replies
    • 13.1k views
    • 
    • TheeSpaniard3500hd
    • July 21

20. Fuel Filter - 2021 L5P

    By Laidback, June 7
    • 5 replies
    • 1.6k views
    • 
    • Darth
    • June 21

21. Killing a Duramax

    By 2500W/T, July 30, 2020
    • 14 replies
    • 3.5k views
    • 
    • Darth
    • June 21

22. 2020 GMC AT4 Garbage Brakes!

    By SVAT4, September 28, 2020
    • 9 replies
    • 4.5k views
    • 
    • Dave M.
    • June 5

23. 3 inch cognito lift

    By ND763, March 24
    • 2 replies
    • 1.3k views
    • 
    • Dave M.
    • June 5

24. Transmission

    By Mat gruber, May 18
    • 2 replies
    • 1.3k views
    • 
    • Laidback
    • May 24

25. Garage Door Opener - No Power

    By 2506S, May 13
    • 0 replies
    • 573 views
    • 
    • 2506S
    • May 13

26. Free DEF from Dealer

    By CMillSilverado, May 10
    • 2 replies
    • 1.4k views
    • 
    • 20Denali21
    • May 13