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2019-2025 Silverado & Sierra Engine & Transmission (L3B/L82/L84/L87/LM2/LZ0)

Technical Discussion, help, and advice for the Chevy Silverado and GMC Sierra small block engines,6/8/10 speed transmissions, along with factory and performance exhausts.
 L3B 2.7L Turbo, L82/L84 5.3L & L87 6.2L, and LZ0/LM2 3.0L Duramax Diesel Engines. 

1,040 topics in this forum

  1. 2020 Sierra Denali 6.2 engine knock / won’t fire

    By Jerryg123,   
    • 5 replies
    • 1.4k views

  3. Muffler Delete / "Flapper Valve" Question...

    By Jason Eisler,   
    • 2 replies
    • 4.8k views

  4. 6.2 Engine whine? 1 2

    By Greyhound6.2,
    • 15 replies
    • 7.4k views

  5. 2022 refresh LM2 banks idash questions

    By PTENEBRU,
    • 2 replies
    • 2.5k views

  6. Secondary Derale Transmission Cooler

    By Jacob Szymanski,   
    • 5 replies
    • 1.9k views

  7. 2021 3.0l duramax silverado def questions

    By Joenelson123,
    • 1 reply
    • 1.8k views

  8. 3.0 lm2 diesel oil - Redline

    By CODY HORNER,
    • 6 replies
    • 2.9k views

  9. 10l80 fluid and filter change procedure

    By Ronjon,   
    • 1 reply
    • 4.6k views

  10. 2020 Sierra 3.0 Duramax bad turbo???

    By TheBigBadWolf,
    • 2 replies
    • 3.9k views

  11. Anyone have a flowmaster dual system? What’s it sound like?

    By s10dragracer888,
    • 0 replies
    • 755 views

  12. LM2 3.0L oil by pass PSI?

    By JCunningham,
    • 9 replies
    • 1.1k views

  13. 3.0 Duramax Delete 1 2

    By chollister29,
    • 26 replies
    • 110.2k views

  14. 6L80 Any Changes from k2 to T1?

    By Whoops,
    • 4 replies
    • 1.3k views

  15. Changing gear ratios

    By 20silverado,
    • 4 replies
    • 2.2k views

  16. Ignition Coil bolt size

    By Daniel Formichelli,
    • 1 reply
    • 468 views

  17. 2020 GMC SIERRA TRANSMISSION FLUID

    By Nasser Aldhaheri,
    • 2 replies
    • 1.5k views

  18. 2019 Silverado 1500 LD Engine Oil Capacity

    By Faron77M,
    • 8 replies
    • 17.2k views

  19. Downsizing and newbie questions.

    By Itchytoe,
    • 4 replies
    • 906 views

  20. LM2 3.0 Automatic cool fill and Coolant air removal process

    By Bubba10417,
    • 2 replies
    • 997 views

  21. Wildly fluctuating engine tenperature 98 Sierra 1500

    By Tiribulus,
    • 4 replies
    • 515 views

  22. Kirkland Signature 0W-20 Full Synthetic Motor Oil 1 2

    By Mr.IMAPCMD,
    • 17 replies
    • 6.2k views

  23. 2020 Chevy 3500 dually locked up while pulling

    By Steve Macedo,
    • 4 replies
    • 1.1k views

  24. Buying oil 1 2

    By DHBWA,
    • 20 replies
    • 3k views

  25. 6.2l OEM cat back performance exhaust.

    By Jus Cruisin,
    • 6 replies
    • 3.3k views

  26. Corsa Sport or Borla S-type

    By jwilso98,
    • 10 replies
    • 7.7k views


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