gplracerx

While installing a Torsen differential in my 2011 Mustang GT, my mechanic, who races a Mustang in NASA American Iron class, found some rotational play in the rear CV joint on the driveshaft, about two or so degrees of rotation, enough to see, barely. He said that wasn't normal. The front CV joint has no play. I bought a used driveshaft on eBay and it has about the same amount of play in the rear joint. According to everything I've read, CV joints aren't supposed to have any rotational play. I was wondering if anyone else has seen this on their car.

Installing a one piece driveshaft isn't an option because it isn't legal in SCCA E Street Prepared class, not to mention that it's quite a bit more expensive than a new OEM two piece.

gplracerx

Fun fact: The CV joint on the differential end of the drive shaft of late model Mustang GT's is not designed to be replaced. The retaining system is one way only. You can get it apart if you beat on it hard enough, but you will damage the splines on the end of the shaft when you do. When your CV joint wears out, you'll need to buy a new drive shaft from Ford or an even more expensive one piece shaft from an after market manufacturer.