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Thread: 4L60E to 4L80E conversion in a GMT900

  1. #21
    Join Date
    Nov 2003
    Location
    Denton Texas
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    20,689
    I am glad i could help. Enjoy the 80e.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  2. #22
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,117
    We've done this swap several times already, thanks for the help Greg, but I had a question.

    What you doing about the PRDL switch? The dash doesn't read the correct gear and a TCM code appears, Transmission Range Switch.

  3. #23
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,689
    The 60e prindle fits right on the 80e and works perfectly. I cannot imagine why the one you did did not work.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  4. #24
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,117
    hmmm, we used the 60 switch and the dash doesn't show the correct underlined gear.
    maybe we did something wrong.

  5. #25
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,689
    yeah, probably just don't have it aligned properly or need to adjust the shift cable.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  6. #26
    Join Date
    May 2008
    Location
    Crowder, OK
    Posts
    8,064
    Still waiting to see someone do this on a 4x4 with autotrac.

    1969 Chevy RCLB C10 350/TH400 SOLD
    2007 Chevy RCSB 4.8 4x4 LS SOLD
    2008 Chevy RCSB 5.3 4x4 LT SOLD
    2010 Chevy CCSB 6.2 4x4 LT SOLD
    2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
    2013 FORD CCSB F350 6.7 Powerstroke 4x4


  7. #27
    Join Date
    Mar 2003
    Location
    San Antonio, TX
    Posts
    11,117
    Not sure exactly what determines an autotrac, but we're doing a 2007 4wd right now. It has the MP2303 transfer case, selectable range switch and nobody has the input gear for it.
    But we have it all apart and i'm pretty sure we got the right gear coming in monday; we'll post up a how to or how it turns out.
    The NP case has been done, as we know. As far as I know, this case hasn't

    There were two options for this case, the 80e and 60e, the 80e has a 32spline and the 60e has the 27 spline.
    The GM exploded pic shows the 32spline being an option, that's we ordered.

    Can't wait to see it work!

  8. #28
    Join Date
    May 2008
    Location
    Crowder, OK
    Posts
    8,064
    Quote Originally Posted by farmtruc View Post
    Not sure exactly what determines an autotrac, but we're doing a 2007 4wd right now. It has the MP2303 transfer case, selectable range switch and nobody has the input gear for it.
    But we have it all apart and i'm pretty sure we got the right gear coming in monday; we'll post up a how to or how it turns out.
    The NP case has been done, as we know. As far as I know, this case hasn't

    There were two options for this case, the 80e and 60e, the 80e has a 32spline and the 60e has the 27 spline.
    The GM exploded pic shows the 32spline being an option, that's we ordered.

    Can't wait to see it work!
    Let me know because I'm wanting to do this. I just didn't want to be the guinea pig and do it on my DD while I'm in school.

    1969 Chevy RCLB C10 350/TH400 SOLD
    2007 Chevy RCSB 4.8 4x4 LS SOLD
    2008 Chevy RCSB 5.3 4x4 LT SOLD
    2010 Chevy CCSB 6.2 4x4 LT SOLD
    2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
    2013 FORD CCSB F350 6.7 Powerstroke 4x4


  9. #29
    Join Date
    Sep 2007
    Location
    Broken Bow, OK
    Posts
    1,441
    Did that input work out?

    What was the part number?

  10. #30
    Join Date
    May 2008
    Location
    Schertz, Tx
    Posts
    2,559
    Latest update (Allen can give you specific details but it was my truck they were working). We had to go with a 3/4-ton transfer case. The stock tcase (MP3023) would not work. They tried a different input shaft and different planetaries but the case itself would not work with the new parts. 4x4 does not work right now but it's just a switching/electronic issue. No appreciable difference with the 80e versus the 60e. The insurance factor is nice to have though!

    07 Z71 4x4, 6.0L, 3.73s, Turbonetics T76 @ 10 psi, 75 shot, Snow meth kit, PLX DM-100 wideband gauge, Nelson tune, Comp 212/216 .557/.561 114 lsa, 60# injectors, Yank 3000, 4L80E , Magnaflow - dumped, e-cutout
    Line-X, Pace Edwards Full Metal Jackrabbit bedcover

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