Vibration problem

[clean8485]

Thanks to everyone for your help and ideas. As I said before, its not a really big deal, as I don't drive the car very much, just aggrevating more than anything. I'll be putting the car away for the winter soon, and now I have some things I can check while its away. Thanks again.

 

[bill]

I'm looking for some ideas here. There is a vibration in my '84 Monte SS that I think is driveline related. It starts at about 85-90km/hr (about 50mph), and I can drive out of it at about 100km/hr (about 60-65mph). The car has a 3.42/1 rear axle gear, and the turbo 350C transmission (no overdrive). The vibration feels like its in the car, not in the steering. The driveline is original in the car, and the car has 119,000kms on it (about 75,000 mi). I've tried a couple of different driveshafts in it, even having the driveshaft balanced, and it hasn't made a difference. I remember reading about someone talking about the bushing in the tailshaft of the transmission causing this type of vibration if its worn, but I don't know if this is the problem with my car. Its not a really big concern, because I don't drive the car much, but it is kind of annoying. Anyone have any thoughts or ideas? Thanks in advance.

torque converter bolts....bent flexplate...torque converter itself....harmonic balancer...bad motor mount(s)>? just some ideas....