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    Put a diff in a RPM
    #1
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    Hi guys. I have an RPM gearbox and would like a diff in it. My college made one and used a 4 wheeler diff. But it didn't work to well.
    I'm going to be doing mainly street driving


    Has anyone done this with success?

    Thanks
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    Re: Put a diff in a RPM
    #2
    Keeper of the Asylum K-fab's Avatar
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    I don't recall where i saw it but I've seen a one off diff'd RPM.
    They'd machined the cases and then made a bolt on case that held the diff in place.
    Don't recall any other specifics, though.
    It did widen up the trans a bit.
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    Re: Put a diff in a RPM
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    What are your thoughts on an RPM on the street? Think it will survive or is a diff a must?
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    Re: Put a diff in a RPM
    #4
    Keeper of the Asylum K-fab's Avatar
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    I ran the Tazcar on the street w/o a diff and we run the RZR on the street all the time and it’s a spool.
    Makes noise in parking lots but other than that, nah, no need at least in my eyes.
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    Re: Put a diff in a RPM
    #5
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    I spoke with Dan late last year because I had a Blurton fnr box that ate itself when the driven shaft support wasn’t put back on. It had an open diff in it that EEE built someone in early 2000. I since have come across 2’different versions that were used. The one I’m told is a diff from a vw rabbit that was modified to fit the case and the other is a beefier version of the first. If they load here are some pics of the parts I have.
    Attached Images Attached Images
    Last edited by MBell; 04-10-2020 at 11:16 PM.
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    Re: Put a diff in a RPM
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    The Wizard bdkw1's Avatar
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    I driven many spooled off road vehicles on the street. For many, many miles. The only time you notice is in parking lots. Then you just have to pitch it into the corner hard enough to unload the inner tire to keep it from chirping.
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    Re: Put a diff in a RPM
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    Thanks guys. I reckon I'll run it and if it blows...worry about it then.
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    Re: Put a diff in a RPM
    #8
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    It may be a requirement for on road use to have a differential in your state.
    I race, therefore I am
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    Re: Put a diff in a RPM
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    Quote Originally Posted by MBell View Post
    I spoke with Dan late last year because I had a Blurton fnr box that ate itself when the driven shaft support wasn’t put back on. It had an open diff in it that EEE built someone in early 2000. I since have come across 2’different versions that were used. The one I’m told is a diff from a vw rabbit that was modified to fit the case and the other is a beefier version of the first. If they load here are some pics of the parts I have.
    I couldn't see the pictures
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