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  1. #1
    Newbie
    Join Date
    Feb 2011
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    Kentucky, USA
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    2

    Default Australian Borg Warner M78 9-bolt rear end modification

    Is it possible to find 3.73 to 4.88 gear and spool for this rear end? I cannot locate parts in the US. It is a vert stout piece and I can find no support for it. Drag racing application in the US. I watch Aussie V8 in the US and hope your membership could help or refer me to someone with information.
    Thank you,
    Carl
    Kentucky, USA

  2. #2
    casual poster
    Join Date
    Jun 2008
    Location
    Laidley Qld
    Posts
    185

    Default

    yes ,3.73 ,3.89 ,4.1 gears are available thru Motive Gears . look on ebay.com.au
    It's a Holden thing you wouldn't understand

  3. #3
    Senior Member blownhemi's Avatar
    Join Date
    Dec 2009
    Location
    NSW
    Posts
    621

    Default

    I'm actually putting a set of 3.89 gears and a minispool in one at the moment.

    Common rear end in Australia, it's found in most of our family cars. Most common gear ratios seem to be 2.77, 2.92, 3.08, 3.23, 3.27, 3.45, 3.73, 3.89, 3.91 & 4.11. I believe there is a 2.53 or something as well but it's pretty rare.

    Just remember to buy parts for the right diff. The BW78 is actually know as the M75 through Borg Warner (7.5in gear - it has 0575 on the gearset). There also the M78 gearset which is 7.75in and it'll have 0578 on the gearsets. there is some interchangability but in most cases it'll do your head in so it's safer to stick with the right stuff.

    I believe Randy's Ring and Pinion (based in the US) is familiar with the Aussie 9-bolt as well. Might be worth giving them a call.

  4. #4
    Newbie
    Join Date
    Feb 2011
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    Kentucky, USA
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    2

    Default

    Thank you very much for your help.

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