Quote:
Originally Posted by Fa20Toybaru
We finished installing the 3" al driveshaft
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DSS has admitted design fault in the AL driveshaft. The issue is the CS of the shaft is not high enough, though this only appears over 105mph. You likely have a balance issue. Mine vibrated at bit at around 65mph too but at track speeds you couldn’t see out of the rear view mirror. If it’s a street car have someone balance it again, if it is a track car call and talk with Kevin at DSS, if you have room in the trans tunnel they can do a 3.5” shaft reusing your joints that will fix it. Here’s a forum member who had failure on the dyno with one.
https://www.ft86club.com/forums/showthread.php?t=148537