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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. 

963 topics in this forum

  1. Trans thermostat included in Powertrain warranty?

    By trp34g,
    • 5 replies
    • 803 views

  3. 2022 3.0 Duramax Def Range low but Gauge reads full???

    By Chris Gardner,
    • 13 replies
    • 5.6k views

  4. 2020 1500 5.3 8-speed trans temp

    By trp34g,
    • 5 replies
    • 606 views

  5. 2023 LZ0 3.0L Duramax Diesel DEF Level Issues

    By Loadmaster,   
    • 0 replies
    • 1.4k views

  6. 2020 LM2 3.0 P3196 Code

    By Jay Palacios,
    • 1 reply
    • 459 views

  7. 2022 Silverado 1500 LTD with 8 speed - Does anyone know what is the opening temp for the TBV

    By Carlos Eduardo Silva,
    • 4 replies
    • 876 views

  8. 2023 Silverado z71 what skid plates?

    By Mshawn,
    • 7 replies
    • 1.1k views

  9. 10spd 10L80/10L90 Transmission flush DIY

    By zhmorrow,
    • 11 replies
    • 28k views

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

    By jlong1984,
    • 18 replies
    • 5.4k views

  11. 2020 Silverado 2500 HD 6.6 gas w/6 speed transmission problems

    By Stoney371,
    • 13 replies
    • 42.8k views

  12. 2023 Silverado 6.2L 0-60

    By Rhino Linings,
    • 7 replies
    • 2.7k views

  13. Tire sizes 2023 Silverado z71

    By Theodore,
    • 1 reply
    • 615 views

  14. On-line owners manual?

    By typhoon186,
    • 1 reply
    • 416 views

  15. 6.2 owners - Dual or Single Flapper 1 2

    By Rob Mugs,
    • 28 replies
    • 13.1k views

  16. 10 Speed tuning

    By Billet Bowtie,
    • 7 replies
    • 2.3k views

  17. Please help…

    By Aaron Amy,
    • 0 replies
    • 461 views

  18. 2021 GMC AT4 3.0 Duramax -making a clacking noise and missing on acceleration?

    By Blu Coburn,
    • 4 replies
    • 1.2k views

  19. 2022 Sierra 1500 Limited 2.7L Turbo Exhaust Options

    By Roy White,
    • 4 replies
    • 1.1k views

  20. A Good Sign

    By TrueBlue,
    • 5 replies
    • 918 views

  21. Diesel Oil Concerns 1 2

    By btj_z71,   
    • 20 replies
    • 7.3k views

  22. Whistling while driving

    By Mack3748,
    • 4 replies
    • 865 views

  23. Best oil and Filter? 1 2 3

    By GS357 S,
    • 30 replies
    • 10k views

  24. Replace thermostat 1 2

    By DHBWA,
    • 15 replies
    • 2.1k views

  25. CAI and tune for 2023 Denali 6.2?

    By typhoon186,
    • 7 replies
    • 1.3k views

  26. Interior heater seems to run cold

    By TrueBlue,
    • 7 replies
    • 686 views


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