Re: Dan Fletcher Super Stock Videos - Opinions
There is one unusual thing that i've seen cause vibrations like this twice now on a 69 nova, and a 79 camaro. The nova was chasing a vibration like this all season and ended up doing most of the things you are. It turned out to be a worn out bushing in the steering box.
The other was on a friends camaro that he has been dealing with most of the season. We have checked and replaced parts in the driveline, and rebuilt the transmission with no luck. When I had the car jacked up I remembered the issue with the nova so sure enough the idler arm was so worn it was ready to fall off. We haven't tryed it yet to see if that fixed it.
I would doubt your issue is there, but is is worth a look...
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