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Engines & Drivetrain (V8, Duramax, TurboMax)

Technical discussion for the 6.2L (L87), 5.3L (L84), 3.0L Duramax (LZ0/LM2), and 2.7L TurboMax. Tuning, maintenance, and 8-speed &10-speed transmission tech.

1,140 topics in this forum

  1. Tire sizes 2023 Silverado z71

    By Theodore,
    • 1 reply
    • 1.3k views

  2. On-line owners manual?

    By typhoon186,
    • 1 reply
    • 775 views

  3. 6.2 owners - Dual or Single Flapper 1 2

    By Rob Mugs,
    • 28 replies
    • 17.7k views

  4. 10 Speed tuning

    By Billet Bowtie,
    • 7 replies
    • 4.7k views

  5. Please help…

    By Aaron Amy,
    • 0 replies
    • 808 views

  6. 2021 GMC AT4 3.0 Duramax -making a clacking noise and missing on acceleration?

    By Blu Coburn,
    • 4 replies
    • 3.8k views

  7. A Good Sign

    By TrueBlue,
    • 5 replies
    • 1.4k views

  8. Diesel Oil Concerns 1 2

    By btj_z71,   
    • 20 replies
    • 12.7k views

  9. Whistling while driving

    By Mack3748,
    • 4 replies
    • 1.3k views

  10. Best oil and Filter? 1 2 3

    By GS357 S,
    • 30 replies
    • 27.4k views

  11. CAI and tune for 2023 Denali 6.2?

    By typhoon186,
    • 7 replies
    • 4.8k views

  12. Interior heater seems to run cold

    By TrueBlue,
    • 7 replies
    • 3.7k views

  13. *Transmission Shudder fixed*

    By NotoriousGT350,
    • 3 replies
    • 10.3k views

  14. 2020 Silverado metal shavings and ball bearings in transmission pan

    By TJK1972,
    • 6 replies
    • 2.3k views

  15. Which brake pads ceramic or semi metallic

    By Chevyguy273,
    • 4 replies
    • 7.7k views

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

    By TrueBlue,
    • 28 replies
    • 5.4k views

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

    By Big_Kahuna,
    • 105 replies
    • 28.3k views

  18. 2020 RST 6.2 Headers

    By Butch Peyton,
    • 0 replies
    • 902 views

  19. Transmission pan water leak?

    By 20silverado20,
    • 9 replies
    • 12.1k views

  20. Transmission Locked Tonight

    By dtholmanmax,
    • 4 replies
    • 1.9k views

  21. Rear Drive Shaft

    By Butch Peyton,
    • 2 replies
    • 1k views

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

    By Arbetrader,
    • 2 replies
    • 3.2k views

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

    By Kevin999,
    • 4 replies
    • 9.3k views

  24. Pinging/detonation ??

    By Deadstockpomp,
    • 2 replies
    • 1.4k views

  25. 3.0 Diesel exhaust tips

    By erogers10287,
    • 2 replies
    • 1.4k views

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