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Thread: FS: Mark VIII IRS Sub-Frame Bushing Kits

  1. #1
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    Default FS: Mark VIII IRS Sub-Frame Bushing Kits

    Ford has discontinued the stock bushings for the IRS Sub-Frame.

    Also, from a performance perspective, the stock bushings allow too much movement of the sub-frame, which can lead to wheel hop and/or poor 60' times in high powered cars.

    I am developing performance bushings made from UHMW with hardcoated aluminum spacers.

    I expect the full kit of 8 bushings and 4 spacers to sell for $400 shipped (lower 48) at this point.

    I plan to begin shipments of the completed kits by mid-April.

    However, I am offering a $50 discount to early adopters who prepay in full prior to April 1st.

    See THIS post on SCCoA for more info.

    Please PM me for payment details if you are interested.
    98 Toreador Red Mark VIII LSC - 13.217 @ 104.78
    98 Laser Red/Black Cobra Coupe (T-56/IRS) - 12.483 @ 110.94

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    Default

    LOL, you're killing me Doug...

    Where do I sign up?

    Check your PMs.
    JP


    Boss 5.3L Modular Mark VIII



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    Quote Originally Posted by driller View Post
    LOL, you're killing me Doug...

    Where do I sign up?

    Check your PMs.
    Just doing my part to make the axiom "How fast do you want go $$?" true.

    PM answered.

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    Here are some renderings of the bushing designs.

    The first two pics are of the upper, the second two are of the lower.
    Attached Images Attached Images

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    Will the hardcoated aluminum sleeves pass through both?
    JP


    Boss 5.3L Modular Mark VIII



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    Quote Originally Posted by driller View Post
    Will the hardcoated aluminum sleeves pass through both?
    There will be a single 1.5" diameter x 3.15" long hardcoated aluminum sleeve that will go through both bushings at each position. This sleeve will accept the stock M12x1.75x129.5 bolt (which BTW, are still available form Ford for $14.33 ea. p/n N805747S100).

    I am also going to provide a 1 1/2" diameter .050" thick stainless steel washer, to go between the top of the sleeve and the frame to prevent the end of the aluminum sleeve from being damaged by the irregular holes in the frame.

    The stock metal brackets/plates will be reused on the bottom of the bushing/sleeve stack.

    The attached pictures show the bushings (upper - lower) as they will be oriented in the car.

    Trust me, J.P., I've thought this one out.
    Attached Images Attached Images
    Last edited by DLF; 03-17-2010 at 09:38 PM.

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    Quote Originally Posted by DLF View Post
    Trust me, J.P., I've thought this one out.
    Oh I trust you, no doubt you have this thought through. I was just confused by your calling the aluminum piece a "spacer". In my mind that would be called a "sleeve".
    JP


    Boss 5.3L Modular Mark VIII



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    Quote Originally Posted by driller View Post
    Oh I trust you, no doubt you have this thought through. I was just confused by your calling the aluminum piece a "spacer". In my mind that would be called a "sleeve".
    You're right, my terminology is incorrect.

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    I received the aluminum bar stock for the spacers today, so the machining starts tomorrow.

    Crap! Looks like I won't get the UHMW until the 25th.
    Last edited by DLF; 03-18-2010 at 09:20 PM.

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    Default Revised Upper Bushing

    Took some additional measurements today, and I won't need as severe a chamfer on the upper bushing as I originally thought.
    Attached Images Attached Images
    Last edited by DLF; 03-18-2010 at 09:28 PM.

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