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Forum: 4speed RWD/FWD Transmission Tuning (incl T42)

4L60E, 4L80E, 4T60E etc transmission tuning, incl T42 TCM.

  1. 4L60E Manual convertor lock up switch.

    Started by Laychut, September 22nd, 2011
    • Replies: 9
    • Views: 22,557
    joecar
    October 13th, 2015 Go to last post

  2. E38/T42 4l60E P0717 Code

    Started by minytrker, February 28th, 2012
    3 Pages •
    1 2 3
    2 Attachment(s)
    • Replies: 29
    • Views: 22,462
    minytrker
    March 17th, 2020 Go to last post

  3. 4L60E won't shift

    Started by eclispe1, December 21st, 2008
    2 Pages •
    1 2
    • Replies: 15
    • Views: 22,028
    joecar
    May 12th, 2009 Go to last post

  4. New Tires, and New Gears, 2010 Truck

    Started by Gordon0652, October 1st, 2010
    3 Pages •
    1 2 3
    6 Attachment(s)
    • Replies: 29
    • Views: 21,732
    joecar
    October 4th, 2010 Go to last post

  5. Converter Locking @ WOT, why

    Started by Rhino79, February 6th, 2011
    4 Pages •
    1 2 3 ... 4
    1 Attachment(s)
    • Replies: 38
    • Views: 21,644
    N0DIH
    November 28th, 2012 Go to last post

  6. 4L60 and shift kit

    Started by SRT10KLLR, April 21st, 2008
    4 Pages •
    1 2 3 ... 4
    2 Attachment(s)
    • Replies: 30
    • Views: 20,689
    VZThunder
    February 21st, 2013 Go to last post

  7. Tuned by frost 4L80E conversion harness and T42 compatibility

    Started by Shupe, August 4th, 2013
    3 Pages •
    1 2 3
    1 Attachment(s)
    • Replies: 22
    • Views: 20,559
    joecar
    May 23rd, 2016 Go to last post

  8. How to soften part throttle shifts: time or pressure?

    Started by Supercharged111, August 22nd, 2013
    4 Pages •
    1 2 3 ... 4
    5 Attachment(s)
    • Replies: 34
    • Views: 20,108
    Supercharged111
    June 1st, 2014 Go to last post

  9. T42 config critique

    Started by IJ., April 15th, 2013
    5 Pages •
    1 2 3 ... 5
    9 Attachment(s)
    • Replies: 43
    • Views: 20,086
    IJ.
    May 2nd, 2013 Go to last post

  10. When throttle kickdown is not set at 100%

    Started by joecar, February 22nd, 2008
    4 Pages •
    1 2 3 ... 4
    8 Attachment(s)
    • Replies: 31
    • Views: 20,000
    joecar
    August 27th, 2012 Go to last post

  11. Loosing 4th once converter is locked

    Started by alian, January 29th, 2011
    5 Pages •
    1 2 3 ... 5
    3 Attachment(s)
    • Replies: 41
    • Views: 19,709
    alian
    May 6th, 2011 Go to last post

  12. Anyway to fool 411 PCM into thinking its connected to 4L60E for TCC operation?

    Started by slow89irocz, July 25th, 2010
    4 Pages •
    1 2 3 ... 4
    3 Attachment(s)
    • Replies: 36
    • Views: 19,328
    slow89irocz
    July 26th, 2010 Go to last post

  13. 4l80e swap stuck in 2nd

    Started by 4wheelin, December 1st, 2007
    2 Pages •
    1 2
    • Replies: 14
    • Views: 19,259
    hquick
    January 22nd, 2008 Go to last post

  14. d2903 factory set at 10?

    Started by Ritch, March 30th, 2010
    4 Pages •
    1 2 3 ... 4
    15 Attachment(s)
    • Replies: 39
    • Views: 19,014
    Ritch
    May 20th, 2010 Go to last post

  15. Transmission Problems?

    Started by snooz, January 23rd, 2006
    4 Pages •
    1 2 3 ... 4
    • Replies: 32
    • Views: 18,941
    a78turbo
    February 19th, 2006 Go to last post

  16. 4L80E Line Pressure

    Started by Hambone, September 9th, 2016
    4l80e, line pressure 2 Attachment(s)
    • Replies: 7
    • Views: 18,881
    Hambone
    September 11th, 2016 Go to last post

  17. Pinout for T42 as connected to a 4L80e in a 2007/2008 Van or Truck?

    Started by GNXClone, October 5th, 2011
    2 Pages •
    1 2
    1 Attachment(s)
    • Replies: 13
    • Views: 18,770
    Taz
    October 6th, 2011 Go to last post

  18. Upshift to 2nd gear when in maual 1st-4L80E

    Started by mysunnshine, January 4th, 2014
    3 Pages •
    1 2 3
    • Replies: 22
    • Views: 18,736
    5.7ute
    December 17th, 2015 Go to last post

  19. Torque Management

    Started by Black02SS, June 1st, 2005
    2 Pages •
    1 2
    1 Attachment(s)
    • Replies: 12
    • Views: 18,338
    goldbergv95
    December 15th, 2008 Go to last post

  20. 06 gmc truck os swap?

    Started by vortecyota, April 20th, 2010
    3 Pages •
    1 2 3
    3 Attachment(s)
    • Replies: 26
    • Views: 18,235
    joecar
    April 22nd, 2010 Go to last post
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