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Thread: Posi unit

  1. #1
    Join Date
    Nov 2004
    Posts
    96
    Hi, I took my one wheel wonder out, and put a eaton posi in. Still have stock 3.42's in it. My 0-60 was 6.9sec, now its 8.0sec. Is it slower because the power is going to two wheels instead of one? I cant understand what went wrong, Im thinking of pulling the posi back out and just switch the gears to 3.73. Can any one help?

  2. #2
    Join Date
    Dec 2003
    Location
    Azle,TX
    Posts
    3,682
    Did you change the computer for the new gears?
    Vortec Performance Tuned
    LQ9 built 4L60 LTs and a billion miles on the speedo!

  3. #3
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    Sounds like you got the bearings too tight or something else is amiss.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  4. #4
    Join Date
    Jan 2005
    Location
    Conway, AR
    Posts
    1,353
    He wouldnt have to change the computer would he? The gears are still 3.42's.

    Chris
    2009 Silverado, HPTuners, all stock.

  5. #5
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    There is nothing to calibrate to tell it that you are now running a LSD vs an open diff. Makes we wonder if you're getting driveline noise that the engine thinks is ping and has pulled timing out. Even with an open diff you are pulling with both tires. It just spins which ever is the easiest when you get into a poor traction situation. Open doesn't mean one wheel drive.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  6. #6
    Join Date
    Nov 2004
    Posts
    96
    thanks for the info. I tried it the other day and got a 7.5 so its going back down. I plan to put 4.10's in it, in the near future. That well help get this big tank rolling

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