Engines & Drivetrain (V8, Duramax, TurboMax)

1,140 topics in this forum

1. Oil filter confusion 1 2

   By Jimbeau, September 20, 2024
   • 19 replies
   • 20k views
   • 
   • Randal Scott
   • April 13

2. Will factories and dealerships provide updates to ECMs to defeat auto start/stop,

   By TrueBlue, February 19
   • 10 replies
   • 1.7k views
   • 
   • Z45
   • April 6

3. No 12v outlets in 2026 gmc Sierra

   By steve3661, February 14
   • 11 replies
   • 2.7k views
   • 
   • AlanK
   • April 2

4. 3.0L Duramax Mystery Rattle/Vibration?

   By Zane, March 3
   • 5 replies
   • 1.8k views
   • 
   • Beers
   • March 28

5. GM Performance CAI Problem: Need Help!

   By Transient, March 26
   • 7 replies
   • 660 views
   • 
   • Transient
   • March 27

6. 2025 3.0L toast 1 2

   By Catchme2003, March 16
   • 18 replies
   • 1.6k views
   • 
   • johnnyquick
   • March 21

7. 24 GMC 1500 3.0 transmission fluid change

   By Dani Sanghera, March 17
   • 4 replies
   • 1.5k views
   • 
   • diyer2
   • March 18

8. 2023 GMC Sierra 1500 Transmission Issues

   By TMNWT, February 26
   • 5 replies
   • 1.2k views
   • 
   • GMCustomerService
   • March 16

9. Additional Coolant sensor port on LZ0

   By Denny56, March 16
   • 2 replies
   • 226 views
   • 
   • davester
   • March 16

10. Engine Cover Mod

    By David Aters, February 24, 2024
    • 7 replies
    • 7.7k views
    • 
    • Mike Sinclair
    • March 4

11. When did you change the transmission fluid in your 10L80? 1 2

    By jlong1984, September 15, 2023
    • 20 replies
    • 33.2k views
    • 
    • davester
    • March 3

12. Scan tool options. 1 2

    By Tom Hoshock, January 29, 2023
    • 27 replies
    • 36.8k views
    • 
    • silveradosid
    • March 2

13. Transmission issues on 2023 Sierra w/10 speed transmission 1 2 3 4 5

    By R MacLeod, October 13, 2023
    • 74 replies
    • 81.1k views
    • 
    • TMNWT
    • February 26

14. Transmission Software Upgrade

    By Ridger, July 9, 2025
    • 1 reply
    • 1.7k views
    • 
    • newdude
    • February 26

15. 2019 6.2L Stumble When Cold?

    By relevante, February 24
    • 4 replies
    • 444 views
    • 
    • mjm-1957
    • February 24

16. Oil Analysis - 2020 6.2L (L87)

    By BainMan, June 10, 2025
    • 9 replies
    • 2.6k views
    • 
    • Black02Silverado
    • February 11

17. Ahhh YES it is the oil, the oil will fix everything

    By johnnyquick, February 8
    • 0 replies
    • 571 views
    • 
    • johnnyquick
    • February 8

18. 2019 6.2L Lifter Early Warning Signs? 1 2

    By relevante, February 3
    • 15 replies
    • 1.5k views
    • 
    • diyer2
    • February 8

19. Oil Filter 1 2

    By M1ck3y, September 19, 2025
    • 20 replies
    • 2.4k views
    • 
    • e.texerado
    • February 8

20. 2025 - 2026 3.0 LZ0 Crankshaft End Play

    By JohnMr19, November 8, 2025
    • 14 replies
    • 7.1k views
    • 
    • Sammy64
    • February 6

21. 22.5 Silverado 1500 LM2 TBV opening temp

    By Mossyoakglock, February 4
    • 2 replies
    • 270 views
    • 
    • Mossyoakglock
    • February 5

22. repair or replace??

    By Daniel Cook, November 12, 2025
    • 6 replies
    • 777 views
    • 
    • Coastie05
    • February 1

23. 2019 GMC Sierra 1500 SLT Rear Differential Rebuild

    By Rick Tate, January 22
    • 2 replies
    • 528 views
    • 
    • Gangly
    • January 23

24. Gen3 Valve Body Part #

    By Bbarley, January 15
    • 2 replies
    • 1.1k views
    • 
    • Bbarley
    • January 15

25. How prevalent is carbon buildup in the 3.0l

    By Haufski762, December 7, 2025
    • 2 replies
    • 731 views
    • 
    • customboss
    • December 26, 2025