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  1. #1
    Join Date
    Oct 2011
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    San Antonio TX
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    Quote Originally Posted by kerrige View Post
    125 in 3rd with plenty left my truck shifts out of 2nd at 88mph lol
    Cool mine does about 110-115 in second


    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.

  2. #2
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    128 when stock with a programmer that only went up to 128mph speed limiter. GPS verified.

    idk since then. Gps feel on shifter in my car and broke.
    Blessed be the Lord my strength which teacheth my hands to war, and my fingers to fight:
    Psalms 144:1

    Si vis pacem, para bellum

  3. #3
    Join Date
    Sep 2008
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    Quote Originally Posted by RS/SS 4.8 View Post
    Cool mine does about 110-115 in second
    Holy crap I'm on taller tires than you and 3.42s! What gears do you have 3.08s? I guess my shift points are near stock though.
    ECSB 2kSierra 2wd 4.8L-K&N-HPtuners-Calspeed LT's-Magnaflow-Tahoe20's-HankookRH06

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

  4. #4
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    Oct 2011
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    San Antonio TX
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    3.23s, 275/55/20. Mine shifts somewhere north of 6200 rpm i think lol.


    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.

  5. #5
    Join Date
    Sep 2008
    Location
    Arizona/Utah
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    3,939
    Quote Originally Posted by RS/SS 4.8 View Post
    3.23s, 275/55/20. Mine shifts somewhere north of 6200 rpm i think lol.
    Same tires different gears and your shift point is higher. As soon as I get my valve train upgraded I will be upping the shift points, but I figure by then I will have 4.10s and an 80e

    You really need to get ur 4.10s installed. What do you shift out of first at?
    ECSB 2kSierra 2wd 4.8L-K&N-HPtuners-Calspeed LT's-Magnaflow-Tahoe20's-HankookRH06

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

  6. #6
    Join Date
    Oct 2011
    Location
    San Antonio TX
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    1,150
    50-55 mph. Waiting for a response from a friend of mine to get the gears put in.


    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.

  7. #7
    Join Date
    Jan 2008
    Posts
    8,031
    atleast 160 here ..cammed 6.0 456s 6spd....the L i was racing was pegged past 140 on his gauge and i was about truck ahead

  8. #8
    Join Date
    Oct 2007
    Location
    Bandera, TX
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    2,921
    I've had my truck in the 190+mph range. I'm pretty sure I've had it right at 200mph if not a little over but ran out of road and had to shut it down. The roads in the hill country are a little rough for those speeds, lol. I know for a fact Allen and I went 188 mph racing a crotch rocket on 410 while tuning... Lol, it was before I had my 200 mph speedo in and was using my gps. It's a fun ride !
    single digit street truck


    for build info

    http://www.ls1truck.com/forums/my-ga...cs-garage.html

    The best advice I have ever heard:... Only take B( . Y . )ST advice from someone that is CURRENTLY running a turbo setup close to, or bigger than what you want......

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