Engines & Drivetrain

2,740 topics in this forum

1. 2014+ AFM (Active Fuel Management) 1 2 3 4 38

   By Ron.s, December 9, 2013
   • 555 replies
   • 297.7k views
   • 
   • CamGTP
   • November 13, 2025

2. 2014+ Exhaust Systems & Mufflers 1 2 3 4 204

   By Escalade1979, December 12, 2013
   • 3k replies
   • 888.2k views
   • 
   • MikeBMW
   • August 2, 2024

3. 2014+ Engine & Transmission Tuning 1 2 3 4 72

   By pendragon, July 23, 2013   

   • 2014
   • 1.1k replies
   • 469.5k views
   • 
   • newdude
   • June 21, 2023

4. 2014+ Intakes (CAI) & Air Filters 1 2 3 4 62

   By GMC-AT, September 22, 2013
   • 915 replies
   • 390.2k views
   • 
   • 16LT4
   • June 25, 2022

5. 2014+ Gas Mileage (MPG) Topic 1 2 3 4 104

   By BringTheRain403, July 21, 2013
   • 1.6k replies
   • 484.2k views
   • 
   • Grumpy Bear
   • March 22, 2022

6. TCM Tuning 6L80E

   By Charleshugh03, July 13
   • 8 replies
   • 567 views
   • 
   • Grumpy Bear
   • 12 hours ago

7. Noise after AFM delete

   By MattK802, July 28
   • 2 replies
   • 270 views
   • 
   • MikeBMW
   • Yesterday at 06:03 AM

8. Possible lifter tick after DOD delete

   By B14Sierra, August 4
   • 4 replies
   • 438 views
   • 
   • davester
   • August 7

9. 6 Speed vs 8 Speed

   By jancebc, July 15
   • 14 replies
   • 912 views
   • 
   • truckguy82
   • July 28

10. Metal shavings on dipstick and filter

    By Clay LeBlanc, July 16
    • 4 replies
    • 508 views
    • 
    • carkhz316
    • July 24

11. No low range 4 x 4

    By dna9656, June 27
    • 2 replies
    • 285 views
    • 
    • GMCustomerService
    • July 20

12. How to Tune 6L80 Silverado transmission

    By rav3, March 28, 2025
    • 13 replies
    • 4.1k views
    • 
    • ballencd
    • July 17

13. Disable AFM for $0: The M5 Method for 6-Speed Trucks

    By BlueV8, July 16
    • 1 reply
    • 301 views
    • 
    • Snowcamo
    • July 16

14. 2018 Sierra 1500 Transfer Case Leak

    By Ryanwehr14, July 14
    • 3 replies
    • 308 views
    • 
    • davester
    • July 14

15. Transmission high temperature in 6L80

    By SLC2, July 4
    • 6 replies
    • 575 views
    • 
    • MikeBMW
    • July 7

16. 2018 Suburban Radiator provide cooling of transmission fluid

    By SLC2, July 7
    • 6 replies
    • 310 views
    • 
    • MikeBMW
    • July 7

17. 2016 Sierra 5.3L L83 new injectors now runs rich.

    By JAI3, July 5
    • 0 replies
    • 213 views
    • 
    • JAI3
    • July 5

18. Tranmission stays in Low

    By ohed, June 10
    • 8 replies
    • 793 views
    • 
    • ohed
    • June 29

19. Cam chain tensioner question

    By B14Sierra, June 27
    • 0 replies
    • 163 views
    • 
    • B14Sierra
    • June 27

20. 2014 - 2018 Chevrolet Silverado/GMC Sierra

    By Hdwrguy, June 22
    • 1 reply
    • 334 views
    • 
    • mikeyk101
    • June 22

21. Transmission jumping out of gear while driving.

    By Mr. Remarkable, February 25
    • 2 replies
    • 375 views
    • 
    • JimCost2014
    • June 22

22. 2014 GMC Sierra 1500 w/5.3L auto, 4wd, Crank but no start, 2MPA high pressure fuel reading

    By Stacey Jaeger, June 7
    • 1 reply
    • 268 views
    • 
    • newdude
    • June 8

23. Some Good Mileage

    By TheRiver, May 25
    • 0 replies
    • 363 views
    • 
    • TheRiver
    • May 25

24. My tick is now a Knock... $$$

    By No Tyme, March 16
    • 5 replies
    • 965 views
    • 
    • txab
    • May 2

25. Can you help me regain my confidence in my engine? 2019 Yukon 5.3 1 2 3

    By BlaineBug, April 26
    • 40 replies
    • 2.3k views
    • 
    • newdude
    • April 29