Spent a few hours on the interstate this weekend and noticed my vibration problems. Here is what I've got.
I replaced the driveshaft with modern u-joints and it was balanced and manufactured by a reputable shop.
Overdrive is all rebuilt and I have replaced the rear leaf springs brand new from espo with all new shackles and shocks.
Engine mounts have been replaced as well.
I have not done any work to the rear end yet. That is my next part of the car to tackle. About 62 mph it the noise and vibration starts to get bad and gets worse the faster it goes. Also gets worse on decel from any speed over 55mph. My guess here is I have a pinion bearing worn out, it is leaking a bit, and I know the seal is bad. Could it be anything else?
If I tear this thing down I'm going to pretty much just replace all the bearings and seals to do it right, I just wanted to see what you guys thought. Thanks!