Re: Sagging left rear suspension
Check the air in the tires, 1/2" could just be the difference in inflation between 2 tires. A better measurment is from the center of the wheel (or axle flange/hub) to the fender lip as it eliminates the tire from the equation. Make sure the cars is on level ground too, it makes a big difference!
I would un-bolt the shocks and lower the car onto the suspension, bounce it a few times then measure again. This will tell you if you have simple shock problem or if you need to dig further. Also make sure you don't have any extra weight sitting on one side or the other that could mess with your measurments.
If it's not a shock then you have to start looking into several things. You could have a bad bushing (spring eyes, upper shackle bushing or body bushings) all can effect how the car sits. It could be the spring itself as well...
As a temp fix you could use a block as you asked about but on the opposite side to lower it to match but don't plan on this as a fix for the problem because what ever is causing this in the 1st place will likely keep going over time.
1/2" isn't very much and depending on overall condition of the car may just be normal wear. Without knowing the cars history over the past 40years don't be surprised if the answer remains elusive until you do a frame off restoration or have changed out a lot of parts and one day it magically sites level. Start with the shocks and other simple stuff I've suggested, you might get lucky...
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