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Thread: Lightweight independent read end with wide ratios?

  1. #1
    Junior Member
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    Lightweight independent read end with wide ratios?

    I am making an lightweight scratchbuilt sports car with front engine/rear wheel drive. It is a very light vehicle (1500lbs total). I am having a real tough time trying to find a lightweight rear end which has flanges (for IRS) that I can get a wide variety of ratios.

    Here is what I have looked at:

    Mazda Miata/RX7 - IRS, lightweight, cannot find alternate ratios
    Supra - IRS, lightweight, cannot find alternate ratios
    Jaguar - IRS, heavy
    Ford - IRS, heavy, lots of ratios

    I have also looked at quick change rear ends, the smallest I can find is from Speedway Engineering which is 75lbs!

    Any suggestions?

    thanks
    d1

  2. #2
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    Re: Lightweight independent read end with wide ratios?

    Have you looked into a aluminum ford 9"housing that is flanged right out of the pumkin and then use Vette or custom aluminum drive shafts. This combo will be super strong and give you the quick change capability of the 3rd member. just a thought.
    Just smart enough to be very Dangerous

  3. #3
    Senior Member TwilightZ's Avatar
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    Re: Lightweight independent read end with wide ratios?

    try Subaru awd rear ends

  4. #4

    Re: Lightweight independent read end with wide ratios?

    The Subaru rear ends might be light, but they could be weak, after all they are built for AWD.

  5. #5
    Senior Member TwilightZ's Avatar
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    Re: Lightweight independent read end with wide ratios?

    i know guys with 500h.p. turbo subaru wrx's that jump 5 ft. in the air during rally races. is that strong enough? put in a good limited slip and i think you would have a strong performer.

  6. #6

    Re: Lightweight independent read end with wide ratios?

    I have a Lincoln Mark VIII as my personal car. 300HP 32 valve all aluminum engine, aluminum driveshaft, aluminum differential, CV Shafts not tubes, aluminum rear uprights and it has OEM air ride. The components in this car are ideal for a home build or Cobra.

  7. #7
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    Re: Lightweight independent read end with wide ratios?

    It is interesting to see what lightweight means to a north american versus a european.

    Anyways, thanks for the suggestions, after a **lot** more research it boils down to just a few:

    Mazda Miata 1990-1993 - IRS, 4.3 gears, 50lbs
    Maxda Miata 1994+ - IRS, upto 5.3 gears, 70lbs
    Subaru/Datsun/Nissan R160 IRS, up to 4.44 stock gears, 45 lbs


    When the finished weight is 1500lbs, 50 lbs is a lot!

    As Twilight says, the R160 Subaru rear end has a **lot** of racing behind it. From the Datsun 510 through to the Subaru rally cars. These rear ends can easiliy handle my 130 HP, 210 ft lbs torque.

    thanks
    Don

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