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Forum: Allison 5 & 6 Speed

Allison 5 & 6 Speed Transmission for Duramax and 8.1L gas.

  1. Exclamation Sticky Thread Sticky: Allison 6spd TCM versions

    Started by GMPX, May 23rd, 2017
    • Replies: 1
    • Views: 25,667
    Move'n Up
    May 23rd, 2017 Go to last post

  1. 2001 operating systems

    Started by coleman1, 16 Hours Ago
    • Replies: 0
    • Views: 30
    coleman1
    16 Hours Ago Go to last post

  2. A40 Full Read option

    Started by GMPX, March 9th, 2015
    8 Pages •
    1 2 3 ... 8
    6 Attachment(s)
    • Replies: 79
    • Views: 102,180
    twinturbo12
    February 17th, 2026 Go to last post

  3. Cool 600 rpm slip limit solved!!!! OS 25941752

    Started by mitchd, May 31st, 2013
    14 Pages •
    1 2 3 ... 14
    15 Attachment(s)
    • Replies: 138
    • Views: 138,508
    mitchd
    February 5th, 2026 Go to last post

  4. A50 replacement

    Started by derkscustomcars, November 1st, 2022
    • Replies: 4
    • Views: 12,566
    killerbee
    August 29th, 2025 Go to last post

  5. A50/T14 confusion

    Started by comnrailpwr, March 21st, 2017
    5 Pages •
    1 2 3 ... 5
    1 Attachment(s)
    • Replies: 48
    • Views: 67,476
    LMLFRMHELL
    August 26th, 2025 Go to last post

  6. Allison 2000 CA Conversions Trans in 2003 Ford 7.3 Excursion

    Started by 496Stingray, February 3rd, 2024
    • Replies: 1
    • Views: 4,680
    YAKPERFORMANCE
    June 2nd, 2025 Go to last post

  7. Allison A59,A61, & A63

    Started by YAKPERFORMANCE, May 29th, 2025
    • Replies: 0
    • Views: 2,238
    YAKPERFORMANCE
    May 29th, 2025 Go to last post

  8. OS 15827766 for A40

    Started by deadlydayne, May 15th, 2025
    • Replies: 7
    • Views: 1,968
    deadlydayne
    May 18th, 2025 Go to last post

  9. 2010 A50 Stock File OS 24252364

    Started by LBZoom, September 3rd, 2015
    • Replies: 4
    • Views: 7,107
    LS1FREEK
    May 6th, 2025 Go to last post

  10. A40 dtc

    Started by NickInMN, April 24th, 2025
    • Replies: 0
    • Views: 1,186
    NickInMN
    April 24th, 2025 Go to last post

  11. 6 speed shift time question

    Started by pinstripebob, November 9th, 2021
    1 Attachment(s)
    • Replies: 1
    • Views: 3,697
    YAKPERFORMANCE
    March 10th, 2025 Go to last post

  12. T93 Support

    Started by Omega_5, January 19th, 2025
    • Replies: 1
    • Views: 1,906
    jesse1026
    March 4th, 2025 Go to last post

  13. Recovering Bricked T14a TCMs

    Started by TwistedDiesel, March 4th, 2020
    3 Attachment(s)
    • Replies: 1
    • Views: 5,270
    EagleBay
    February 26th, 2025 Go to last post

  14. Stock Calibration Needed

    Started by NickInMN, November 18th, 2024
    2 Attachment(s)
    • Replies: 2
    • Views: 2,924
    NickInMN
    February 5th, 2025 Go to last post

  15. LBZ TCM Tune

    Started by Sydo, October 4th, 2024
    2 Attachment(s)
    • Replies: 7
    • Views: 42,692
    Sydo
    October 5th, 2024 Go to last post

  16. Looking for A50 TCM file for 2015 LML

    Started by TWITCH02X, October 3rd, 2024
    • Replies: 0
    • Views: 11,353
    TWITCH02X
    October 3rd, 2024 Go to last post

  17. '06 6speed tuning inconsistancies

    Started by bballer182, September 6th, 2009
    2 Pages •
    1 2
    • Replies: 10
    • Views: 18,164
    EagleBay
    August 17th, 2024 Go to last post

  18. T87A Support

    Started by thatcompoundL5P, August 2nd, 2024
    1 Attachment(s)
    • Replies: 2
    • Views: 7,310
    thatcompoundL5P
    August 2nd, 2024 Go to last post

  19. File Service

    Started by cummins-bin, June 27th, 2024
    • Replies: 0
    • Views: 5,711
    cummins-bin
    June 27th, 2024 Go to last post

  20. flashing 6spd allison os into 5spd allison tcm

    Started by Scarface, April 10th, 2017
    • Replies: 9
    • Views: 13,709
    pc3332132
    March 27th, 2024 Go to last post
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