Rear end sits too low - 1984 Cadillac Eldorado

bad shock

Sounds like you have air ride and your system has developed a leak. I suggest getting it fixed soon. You will burn up your compressor and that can get expensive.

Probably your shocks or springs have failed or there's too much stuff in the trunk.

The shocks do not set ride Hightower. The leaf springs set ride hieght in the rear. So ether the leaf springs are worn out or the shackles that hold the springs to the frame are broken (should be very obvious if they are). Most likely the rear leaf springs are the problem.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

90% of all vehicle questions or issues that have
to be checked out,unless purely mechanical,
will require the use of a professional grade scan
tool. So for the most part very few people can
work on todays technology.
You will need a repair shop, I would do not
ever recommend a dealer for anything,some people do

leaky air shock. have someone start the car, u listen for hissing from rear shocks

Has one or both bad rear air bag's.

Sounds like the front "air ride suspension" is out.
That works off rubber bags built into the springs. If one or both has developed a leak/hile, it lets the front end (or rear or both) drop to ride on the bottom of the suspension.
Get the wallet out. It's expensive.
Sorry :-(

the ride control bags are in the rear only. you probably have a leak in 1 of the air lines or the bags are bad.

You may have either leaking shocks. follow the air line from the shock to the compressor.