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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. 

1,039 topics in this forum

  1. Tire sizes 2023 Silverado z71

    By Theodore,
    • 1 reply
    • 884 views

  3. On-line owners manual?

    By typhoon186,
    • 1 reply
    • 496 views

  4. 6.2 owners - Dual or Single Flapper 1 2

    By Rob Mugs,
    • 28 replies
    • 14.7k views

  5. 10 Speed tuning

    By Billet Bowtie,
    • 7 replies
    • 2.8k views

  6. Please help…

    By Aaron Amy,
    • 0 replies
    • 582 views

  7. 2021 GMC AT4 3.0 Duramax -making a clacking noise and missing on acceleration?

    By Blu Coburn,
    • 4 replies
    • 2.1k views

  8. A Good Sign

    By TrueBlue,
    • 5 replies
    • 1.2k views

  9. Diesel Oil Concerns 1 2

    By btj_z71,   
    • 20 replies
    • 8.8k views

  10. Whistling while driving

    By Mack3748,
    • 4 replies
    • 990 views

  11. Best oil and Filter? 1 2 3

    By GS357 S,
    • 30 replies
    • 14.9k views

  12. Replace thermostat 1 2

    By DHBWA,
    • 15 replies
    • 10.3k views

  13. CAI and tune for 2023 Denali 6.2?

    By typhoon186,
    • 7 replies
    • 2.4k views

  14. Interior heater seems to run cold

    By TrueBlue,
    • 7 replies
    • 910 views

  15. *Transmission Shudder fixed*

    By NotoriousGT350,
    • 3 replies
    • 3.3k views

  16. 2020 Silverado metal shavings and ball bearings in transmission pan

    By TJK1972,
    • 6 replies
    • 1.6k views

  17. Which brake pads ceramic or semi metallic

    By Chevyguy273,
    • 4 replies
    • 3k views

  18. Flapper valve, useful or not in dealing with drone 1 2

    By TrueBlue,
    • 28 replies
    • 3.5k views

  19. What Engine You Chose and why VOTE 1 2 3 4 8

    By Big_Kahuna,
    • 105 replies
    • 24k views

  20. 2020 RST 6.2 Headers

    By Butch Peyton,
    • 0 replies
    • 683 views

  21. Transmission pan water leak?

    By 20silverado20,
    • 9 replies
    • 6.7k views

  22. Transmission Locked Tonight

    By dtholmanmax,
    • 4 replies
    • 1.6k views

  23. Rear Drive Shaft

    By Butch Peyton,
    • 2 replies
    • 704 views

  24. Gm Dexos D oil part number has changed (which one do you use in your 3.0 Duramax)?

    By Robert Hein,
    • 2 replies
    • 1.9k views

  25. Will a L86 fit in a 2020 GMC Sierra with a L87

    By Kevin999,
    • 4 replies
    • 4.2k views

  26. Pinging/detonation ??

    By Deadstockpomp,
    • 2 replies
    • 1.2k views


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