I've been chasing a strange 45mph vibration in my 87 turbo for a while. I jacked the back of the car up and ran it off the ground at 45mph and the vibration was very bad. I was checking for play in all the rear end parts when I noticed the CV flange on the passenger side of the diff clunks in and out about 1/4". The driver side is solid. I'm guessing this is causing the vibration. Is this something that can be fixed or should I just look into swapping another diff?