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Thread: what does it take to make a 6l90 work

  1. #1

    what does it take to make a 6l90 work

    I'm doing a swap, trying to get a game plan on a trans. Ive seen the 6l80's around. I wanna run the 6l90 just cause I want a solid powertrain. I searched it out and found 6l80 stuff but not much 90 stuff.

  2. #2
    Join Date
    Oct 2011
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    Unless u have a nnbs it hasnt been done. 6l90 is heavier duty and slightly longer than the 6l80 but other wise the same electronically. I have one a 6l90 and one day it will be going in my rcsb, someday.


    4.8, TSP 220, 6L90 swap, 3400 Stall, 4.10s w/30" drag radial and T76 @ 16lbs.
    Best ET 11.54@114 w 1.52 60ft
    Raceweight 4905 lbs.

  3. #3
    Quote Originally Posted by RS/SS 4.8 View Post
    Unless u have a nnbs it hasnt been done. 6l90 is heavier duty and slightly longer than the 6l80 but other wise the same electronically. I have one a 6l90 and one day it will be going in my rcsb, someday.
    I'm new here lol, nnbs?

  4. #4
    Join Date
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    New newer body style
    Aka 07-13
    ECSB 2kSierra 2wd 4.8L-K&N-HPtuners-Calspeed LT's-Magnaflow-Tahoe20's-HankookRH06

    waiting to go in... 3.90s, 214/220cam

  5. #5
    Join Date
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    Oh yea
    88 till 98 = OBS. Old body style
    99 to early 07. = NBS. New body style
    Late 07 till 13. = NNBS. New new body style


    4.8, TSP 220, 6L90 swap, 3400 Stall, 4.10s w/30" drag radial and T76 @ 16lbs.
    Best ET 11.54@114 w 1.52 60ft
    Raceweight 4905 lbs.

  6. #6
    Join Date
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    It's 99-07 CBS classic body style
    07-13 NBS new body style
    But apparently everyone got stuck saying it the way RS/SS 4.8 is stating.

  7. #7
    Quote Originally Posted by vrod25 View Post
    It's 99-07 CBS classic body style
    07-13 NBS new body style
    But apparently everyone got stuck saying it the way RS/SS 4.8 is stating.
    Got it. Do you guys know if drive shaft, yoke, and rear end are all different for a 6l90? As is a 4l60 differs from a 4l80... It was mentioned earlier that the electronics are the same, are we talking exactly? As in plug ins and everything?

  8. #8
    Join Date
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    Yes the 6l90 yoke is alot bigger than the 6l80. I have been told that if your truck came with a 6l80 and u put a 6l90 the only difference
    Is the bigger outputshaft and the 90 is like 1/2" longer.

    Found it. Check this out.
    http://www.performancetrucks.net/for...e-swap-472501/


    4.8, TSP 220, 6L90 swap, 3400 Stall, 4.10s w/30" drag radial and T76 @ 16lbs.
    Best ET 11.54@114 w 1.52 60ft
    Raceweight 4905 lbs.

  9. #9
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    I hate nnbs.

  10. #10
    Join Date
    Oct 2011
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    Yea yea u obs lover


    4.8, TSP 220, 6L90 swap, 3400 Stall, 4.10s w/30" drag radial and T76 @ 16lbs.
    Best ET 11.54@114 w 1.52 60ft
    Raceweight 4905 lbs.

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