Depending on the year of your gto it could be a buggered CV joint on one of your back wheels. All GTO/3000GT are four wheel drive but up to the mid to late 90's they had four wheel steering. The usual symptoms of a buggered CV joint are loud rattling and/or vibrating from the affected wheel at around 30 - 40 mph and often a loud clunk when cornering at low speed
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check for bulges in the side walls of the tyres and check for belt separation. Disconnect the front axles into free wheel mode and if the noise is not there it will be tyre related as there is no movement in the diff or drive axles
It sounds like you have a lot of wear on your ping and pinion gears in the rear end. Ford has a product you can purchase from their parts dept that will help with the noise but eventually you will need to get the gears replaced. The product is a friction modifier designed just for rear ends.
check if you tires have rayon cords or steel belts. this is a problem associated with the older tyres that had rayon cords as the main structure of the tyre. When left standing after running and allowed to cool the rayon belts actually took on a flat spot on the bottom and the noise lasted until the tyre warmed up enough for the tyre pressure to make the tyre round again. In extreme cold it may be the same for steel belted radials as the flat bottom of the tyre would hold the shape until the rubber warmed up .
Have you had this listened to or driven by a front end repair person, they are very good at noises, i think this is a worn part that causes this, just can't remember which one, the dealer is your best choice here.
Check front tyres & wheel bearings espesially the R/H/F. Feel tyre for high / low spots on inside & jack up & spin wheel if you get noise while jacked up it is not the tyres but wheel bearing or brake pads but more than likly a crook bearing by the sound of it. It needs to be tended to ASAP
Many times, rear tires that are out of round or severely cupped or feathered, or that are out of balance can create this type of issue. My first recommendation would be to have them and the wheels on the rear of the car inspected. There may not seem like there is much wrong visibly if you look at just the tread of the tires, but a good tire tech can spin them up and give you some solutions, and the inspection itself is inexpensive. Hope this helps.
The problem is the rear thermostatic expansion valve (TXV).
It is behind the left rear quarter trim panel.You can pull the panel back to access the valve to make sure that that is the noise.If so you will nedd to have AC system evacuated and replace valve and recharge the system. The part number is YF2Z-19849-AA.