6.6L Gas V8 (L8T)

256 topics in this forum

1. Non-dexos oil 1 2 3 4 5

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

2. A few items added to the 2500.

   By GAMark, April 14
   • 10 replies
   • 1.3k views
   • 
   • GAMark
   • April 29

3. howdy from CO

   By c4racer2, April 25
   • 3 replies
   • 440 views
   • 
   • c4racer2
   • April 27

4. Anyone have a BANKS PEDAL MONSTER on their L8T??

   By No F-bdy Bs, April 22
   • 5 replies
   • 925 views
   • 
   • Byrds8
   • April 24

5. 2021 6.6 gas Hollow tapping noise

   By Dusilligaf, March 23
   • 10 replies
   • 761 views
   • 
   • AT4X Steve
   • April 21

6. Oil filler extension tube 1 2

   By Randal Scott, March 21
   • 18 replies
   • 2.2k views
   • 
   • bruceb58
   • April 16

7. Hello from GA.

   By GAMark, March 26
   • 11 replies
   • 704 views
   • 
   • slj2008
   • April 14

8. 2021 Chevy Silverado 2500 HD L8T SELF DESTRUCT

   By Tallman3, April 1
   • 6 replies
   • 1.2k views
   • 
   • GMCustomerService
   • April 2

9. WDH or not on 1-Ton Trucks 1 2 3 4 8

   By Dr1ft3r, February 20, 2023   

   • weight distribution hitch
   • 107 replies
   • 18.9k views
   • 
   • GAMark
   • March 27

10. Current Part Number for 153F Transmission Cooler Bypass Valve for 6L90

    By Another JR, March 26
    • 0 replies
    • 277 views
    • 
    • Another JR
    • March 26

11. 2022 Silverado 2500HD with the dreaded 6 speed shudder 1 2

    By Rogue Leader, February 2
    • 18 replies
    • 3.9k views
    • 
    • Rogue Leader
    • March 25

12. Cold start one second long awful engine sound 1 2 3 4 5

    By Jettech1, December 1, 2022
    • 70 replies
    • 23.4k views
    • 
    • Jettech1
    • March 24

13. Add engine oil!!! 1 2 3 4 22

    By Truston Gunter, December 15, 2021
    • 329 replies
    • 90.2k views
    • 
    • KARNUT
    • March 21

14. 6.6L Gas Transmissions: 6l90 vs. 10L1000 1 2

    By Coop8202, February 11, 2025   

    • 2500HD
    • gas
    • (and 3 more)

      Tagged with:

      • 2500HD
      • gas
      • 6.6l gas
      • 6l90
      • transmision
    • 15 replies
    • 16.9k views
    • 
    • Pryme
    • March 18

15. Transmission Oil Cooler Lines - Replacement

    By darleyhavidson, March 4
    • 5 replies
    • 988 views
    • 
    • darleyhavidson
    • March 5

16. Normal L8T noises? 1 2 3

    By BuckWallace, October 27, 2023
    • 36 replies
    • 13k views
    • 
    • Byrds8
    • February 21

17. Noise while driving

    By sllewm, July 5, 2024
    • 6 replies
    • 3.6k views
    • 
    • AndrewF
    • February 21

18. 6.6 Gasser Longevity 1 2 3

    By MORSNO, May 13, 2025
    • 34 replies
    • 11.2k views
    • 
    • James Beyer
    • February 15

19. GM and Allison Get Back Together

    By Z45, February 6
    • 2 replies
    • 623 views
    • 
    • Z45
    • February 9

20. Driving in a blizzard last night 1 2 3 4

    By dieselfan1, December 30, 2025
    • 52 replies
    • 2.7k views
    • 
    • Chuck FB
    • January 4

21. How low can you go? T-stats that is..

    By mrjulian416, October 3, 2025
    • 7 replies
    • 1.1k views
    • 
    • Black02Silverado
    • December 18, 2025

22. 2022 L8T 6.6 Oil Use Calculation (when to worry and when not to)

    By UltimateToolReviews, December 5, 2025
    • 6 replies
    • 1.2k views
    • 
    • UltimateToolReviews
    • December 6, 2025

23. Oil Test From Break-In vs 15k

    By stlchevy61, November 4, 2025   

    • oil
    • oil change
    • (and 1 more)

      Tagged with:

      • oil
      • oil change
      • oil life
    • 4 replies
    • 871 views
    • 
    • Black02Silverado
    • November 10, 2025

24. Solved! 'ish' Coolant Leak + Possible Engine Replacement

    By BigAlBuilds, November 7, 2025
    • 4 replies
    • 2.1k views
    • 
    • GMCustomerService
    • November 9, 2025

25. Magnetic oil drain plug

    By dieselfan1, October 31, 2025
    • 2 replies
    • 469 views
    • 
    • dieselfan1
    • November 1, 2025