6.6L Gas V8 (L8T)

255 topics in this forum

1. 10L1000 anyone with High Mileage ? I hate Damocles.... 1 2 3 4 6

   By Homer1959, October 29, 2025
   • 75 replies
   • 8.1k views
   • 
   • Chuck FB
   • July 23

2. Is your l8t engine bay super dusty?

   By No F-bdy Bs, July 21
   • 6 replies
   • 391 views
   • 
   • rjgvt
   • July 22

3. Shopping for new truck and have question. 1 2

   By Gary Doolin, June 3
   • 21 replies
   • 1.5k views
   • 
   • KARNUT
   • July 20

4. Correct way to service 2024 l8t allison trans? 1 2

   By Aimatdeer, March 15, 2025
   • 26 replies
   • 7.3k views
   • 
   • carkhz316
   • July 18

5. Road Master Active Suspension

   By GAMark, June 16
   • 7 replies
   • 661 views
   • 
   • GAMark
   • July 8

6. Trading 7.3 (Godzilla) for G.M.C gas 1 2

   By lsttype, June 18, 2023
   • 20 replies
   • 22k views
   • 
   • KARNUT
   • July 7

7. Trim level custom/pro

   By Gary Doolin, June 22
   • 10 replies
   • 688 views
   • 
   • BCGM
   • July 6

8. J&L OIL SEPARATOR CO 1 2

   By GAMark, May 13
   • 21 replies
   • 1.5k views
   • 
   • Pryme
   • July 5

9. Fluid Change Questions 1 2

   By Core-Lokt, May 20
   • 28 replies
   • 2.3k views
   • 
   • Chuck FB
   • July 4

10. Oil Consumption 1 2 3 4 20

    By riddler, May 27
    • 297 replies
    • 13.5k views
    • 
    • MORSNO
    • July 3

11. summer road trips in the 2026 2500HD

    By c4racer2, June 22
    • 9 replies
    • 878 views
    • 
    • c4racer2
    • June 30

12. Turning radius

    By Randy Ginoza, June 26
    • 4 replies
    • 393 views
    • 
    • StingerZ16
    • June 29

13. MPG at 600 miles 1 2

    By 2021 HD, September 10, 2023
    • 22 replies
    • 6.6k views
    • 
    • Byrds8
    • June 29

14. New or used

    By Gary Doolin, June 18
    • 5 replies
    • 510 views
    • 
    • Chuck FB
    • June 19

15. first oil change - 2026 2500HD gas

    By c4racer2, June 9
    • 14 replies
    • 1.3k views
    • 
    • c4racer2
    • June 18

16. 2024 6.6 gas 28000 engine failure 1 2 3 4 5

    By James McArthur, April 28
    • 64 replies
    • 5.2k views
    • 
    • riddler
    • June 3

17. Which tire? 1 2 3

    By GAMark, April 15
    • 37 replies
    • 2.9k views
    • 
    • Chuck FB
    • June 2

18. L8T and 93 octane or 90 rec gas.

    By GAMark, June 1
    • 12 replies
    • 962 views
    • 
    • GAMark
    • June 2

19. Banks Diff Cover.

    By GAMark, May 28
    • 0 replies
    • 281 views
    • 
    • GAMark
    • May 28

20. Cat back.

    By GAMark, May 10
    • 5 replies
    • 804 views
    • 
    • dal1980
    • May 25

21. L8S 6.6L V-8

    By C/K Man, August 21, 2025
    • 3 replies
    • 1.7k views
    • 
    • C/K Man
    • May 24

22. 2022 Trans temp... 1 2 3

    By hdhp, October 9, 2021
    • 34 replies
    • 25.5k views
    • 
    • Tyler Gibbs
    • May 21

23. Oil drain bolt washer. 1 2

    By GAMark, May 4
    • 27 replies
    • 1.9k views
    • 
    • Another JR
    • May 16

24. I would like to start a NEW catch can post for all to follow. 1 2 3 4 8

    By Jettech1, January 30, 2023
    • 113 replies
    • 24.2k views
    • 
    • Grumpy Bear
    • May 1

25. Non-dexos oil 1 2 3 4 5

    By chris-i, March 11
    • 66 replies
    • 5.2k views
    • 
    • PunchT37
    • April 30