1964 Skylark New Issue in Buick - Post War - Technical Posted June 10, 2017 Update (sort of). I didn't have as much time to diagnose this as I had hoped, but I did manage to find a few minutes to get under the car last week. All I had time to do was disconnect he speedometer cable in order to verify that the cable isn't where the sound is coming from. It makes a click about every quarter turn of the driveshaft. My next steps, which likely won't happen for at least two weeks, will be to remove the speedometer gear from the tail housing and see if perhaps the gear is making the sound. If not, perhaps the governor would be the next place for me to look. After that, who knows? If I can't pinpoint it after that I'll probably just let let it go until I learn to live with it, or until it gets worse or something blows up. It's not very loud and it doesn't seem to be serious, nothing like a bearing or anything like that. I have two other, more pressing things to attend to right now, like a leaking power steering pump shaft bearing and a pretty good oil leak coming from the passenger side of the engine apparently coming from somewhere above the starter. It's always something. Of course if I didn't like complaining and working on old cars I'd have bought a new Buick!