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.


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.


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.


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.

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.

Man i just installed mine and i noticed the same thing. But i do have a vibration. Did they reply or able to find a way to fix it?