Goat; I love your car, that color is awesome.
I know that you already know what I am talking about, but just want you to consider could it be the springs? Remember the springs are what take the jolt from any road bump, the shocks, despite there name do not absorb shock, they just prevent the spring from oscillating and continuing to oscillate, they dampen it so to speak.
The test for a weak shock is to push down on the car while standing next to it and see if it goes does easy and bounces, if it does they are weak.
The shocks and springs work together, surely and of course modifying the shock spring with air bags etc can effect things differently.
Sometimes a car has low original mileage but the spring has been on there 50 years. Car can be painted, new motor but nobody changed the springs. I put all new spring and bushings on, and shocks, makes a great ride on my 66 Lemans, which is almost a body match for your car, no jolts.
Just check it, factory spring you can check ride height with ruler.
Love that GTo!
The color is paint code P2 Silverglaze w/ black vinyl top it is how it came out of the factory in Fremont.
I have replaced all the springs, the driver's side rear was 3/4" shorter than the passenger side.
I have replaced all the rubber except for the body mounts, new trailing arms, tie rod ends upper and lower control arm bushings, front and rear sway bars and did the did the front disc brake conversion.
The only thing that wasn't original was the front sway bar bushings but it was the stock bar with 1 1/4 bushings so it was just flopping in there, I replaced the bar with a 1 1/4" and all that rubber.
The only thing besides the wrong bushings that was replaced were the shocks.
When I bought it the car didn't handle worth a damn and I had to saw the wheel on every corner and it had severe body roll now it corners and stops perfect.
The rebound on these KYBs is okay but pushing down there is zero resistance, you can feel it even hitting the smallest rough spot in the road.
I think they were replaced in 08 when the previous owner had the cosmetics done and they are just shot.
The cosmetics of the car were done well but I have been going over it and fixing a lot of things that were done half assed like the steering column the 3 bolts holding the bracket were there but the 4 bolts holding the bracket to the jacket were missing and the wheel was just flopping around.
I also had it flatbedded to my house when I bought it, the oil was running out of the rear main because the guy was running 0-20 wt synthetic oil in it.
When he told me that I wasn't about to drive it up the mountain and I wanted to go over it before I drove it.
I flushed that out and put in 10-40 with ZDDP and now it doesn't leak a drop.
I also replaced the tranny cooler lines with stainless, they were cut at some point and had a hose clamped in there, a big no no!
I don't know WTF they did under the dash, speaker doesn't work and I have a couple mystery light sockets and connectors just hanging.
That is another can of worms I will open in the spring for now I am just going to drive it before I have to store it for the winter.