New Rear End

Discussion in 'The Garage' started by Adam Gustafson, Sep 24, 2018.

  1. Adam Gustafson

    Adam Gustafson New Member

    Messages:
    8
    Likes Received:
    0
    Joined:
    Sep 24, 2018
    Hey Guys! My posi-trac system makes a clicking noise in the rain and I am simply looking to upgrade my rear axle. I want the Ford Nine inch but I am not sure what the best gear ratio would be for my car. I drive a 99 Sn95 Base model with some minor engine upgrades CAI, BBK throttle body, and a Bama Tune. As far as other modifications I have SR Performance sway bars and Coilovers. My driving style is spirited on the back roads!

    What would be the best rear gear ratios for my car! Thanks for the help.
     
  2. Makoto

    Makoto New Member

    Messages:
    92
    Likes Received:
    86
    Joined:
    Nov 24, 2016
    Location:
    Houston
    You aren't making anywhere near four digit horsepower so you don't need a 9 inch.
    It sounds like you need to diagnose your root issue.

    A clutch pack rebuild for your current axle is easy and a couple hundred bucks.
     
  3. duh09

    duh09 Legend

    Messages:
    9,241
    Likes Received:
    130
    Joined:
    Apr 23, 2008
    Location:
    Alabama
    What motor/trans are you running? That'll make a huge difference. I've had 2.73, 3.27, 3.73, 4.10.... my current car is still rocking the 2.73 and will be getting upgraded to 3.27 or 3.55 when it comes time as this car is 99.4% daily beater.

    9" is way overkill and you'll be just fine rebuilding the factory LSD and putting gears in it.
     
  4. 98snakehorse

    98snakehorse Well-Known Member

    Messages:
    1,722
    Likes Received:
    208
    Joined:
    Oct 24, 2011
    Location:
    Southeast, IA
    The 8.8 can handle loads of power. It would be much cheaper to just upgrade to a 31 spline diff and axles.