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1G Driveshaft Shop (DSS) 3.5" Adapter Plate Phasing

Posted by architechnik, Sep 24, 2020

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  1. architechnik

    architechnik Proven Member

    686
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    Joined Jun 21, 2007
    Glad, Oregon
    I purchased a 1g DSS 3.5 aluminum driveshaft and when it arrived, I decided to mock up the connection as I was documenting the build. I quickly found that the 4-bolt to 6-bolt conversion plate was oriented with one point of the 6-bolt star shape at 90 degrees to the yoke arm for that side.

    The adapter plate says MIPL-1 if anyone can confirm the appropriate part number was sent.
    upload_2020-9-24_10-23-25.png

    That puts the the two ends of that driveshaft completely 90 degrees out of phase. Any other position/orientation would still be around 30 degrees out of phase in either direction. It appears one bolt needs to be aligned with the yoke arm. Since the 4-bolt side is asymmetric/rectangular, it cannot be bolted on that side in any other orientation.
    upload_2020-9-24_10-22-24.png

    Just like this image, it would put it at maximum out of phase. For a U-Joint that would cause highly inconsistent speed of the output side, which I could only imagine the amount of vibration, bucking, and drivetrain damage.
    upload_2020-9-24_10-23-42.png

    Alternatively, I could unbolt the stock side of the 6-bolt flange and maybe orient it so that the bolt locations are different, but that seems VERY unusual and would definitely require a rebalance.

    Is there some reason why this was changed? Could I have the wrong one?
    Are my stock driveshafts weird? (I have two '91 and '94 both with the same orientation of the 3rd shaft.)

    I did find an image of the bolt orientation that would be correct for this setup. MISH1-dss-aluminum-driveshaft-1g-dsm-3_1024x1024.jpg

    I'm reaching out here because I'm trying to make sure I'm not crazy. I've been trying to contact Driveshaft Shop for about a week now. I've called a few times and they keep telling me I need to talk to Kevin. I've sent Kevin several emails and not received a response.
     

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    Last edited: Sep 24, 2020

    719  3

    1994 Mitsubishi Eclipse GSX
    325 whp · 344 lb/ft · 1G DSM
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    GST with PSI likes this.

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