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Message: <blockquote data-quote="JPuehl" data-source="post: 1508980" data-attributes="member: 29309">Thanks for the response. About 1 month ago I replaced all the bushings associated with the IRS, including the diff bushings and the upgraded bolt that you reference with the FullTiltBoogie "kit". The slop is the same before and after the update so I know it's not those.And it's funny you mentioned the smaller bolts causing the "Cobra Clunk" as my car did have the smaller bolts and when reinstalling the IRS with all the new Delrin bushings I have a theory as to why they used the smaller bolt. When I reinstalled the IRS all bolts lined up correctly except the passenger side front bolt. The bolt hole on the inboard side lined up so I was able to get the bolt started, it made it into the bushing but was no where near lining up with out outboard hole in the chassis. My theory is that Ford knew this so they used a smaller bolt rather than correcting the die that made the panels. I did use the correct tools and method to install the bushings and given the bushings are made of Delrin, I know the issue was not an out of alignment bushing. I simply used a rotary file, opened the hole and completed the installation.The driveshaft is also an upgrade aluminum piece with solid U-joints.In the end it may just be the way it's supposed to be but is just kinda annoying but not something I'm not used to already. Just want to make sure it's not an actual issue that needs to be dealt with.</blockquote>