I've got a pretty good vibration at 70 or so mph...where do I begin?? The goofy thing is that my 67 kind of had the same thing...

Where do you feel the wobble, steering wheel? seat of the pants?

oh yeah, sorry. in the seat of the pants...don't know if it's driveline or alignment or tire balance or what???

Rear tire/rim or driveline issue. Rotate the tires front to back and see if it changes. If it does, tire/rim issue. If not, you've eliminated 2 things.

I would put it up on WOODEN blocks rather than jack stands or anything else. When it is very securely blocked I would start the car, put it in gear, and crawl under with a paint stick or any kind of marker. Very slowly move the marker towards the front of the driveline until it just starts making a mark. Do the same at the rear and center. Use the pipe part of the driveline and be very careful around the u-joints. This will let you know if it is bent or off center. Do the same to the sides of the rims to make sure they aren't bent. If everything still checks out okay try it on the road surface of the tire. If all of these tests are acceptable I would check the bearings, etc. in the differential.

Wow....now that sounds a little dangerous to me! Just recently here at work a crane operator got caught by the spinning driveshaft of his mobile crane when he crawled under it, he was very lucky to come out with minor injuries, but you won't find me doing anything like that no more!

But back to the question, I had almost the same problem once and it turned out to be a worn out ball joint. Found that after all wheels were checked and found ok. Jack the car up with the front wheel from the floor and check for play. Good luck!

Thanks for the advice...I at least know where to start.

I just finished using the 'dangerous' method on a 4wd Scout. It turned out to be inside of the transfer case. I don't hold it against anyone for not doing something they don't feel safe doing so please don't take this as an insult. I take proper precautions like no jewelry or sleeves, etc. and have been doing things old-school for years because...I AM old schoolED!

The most obvious and likely reason is that your tires need to be balanced. I haven't found anybody lately that does it, but the best solution is having them balanced on the vehicle.