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The dealership is checking on the 3.55 rear issue.

Jacked up the rear end and the tires spun in opposite directions. I'm getting mixed input on whether that means open or anti-spin, so I decided to test it the old fashioned way. Two black tracks, it's anti-spin.



Open spins one wheel. If you can see the driveshaft pretty decently and are able to spin the tires while lifted, mark the driveshaft and spin the tire one full rotation and count how many times the driveshaft spins around. See if it spins 3.21 revolutions or 3.55 revolutions.