Replaced rack and pinion now steering clunking.
 

If you're having a hard time turning the steering wheel, it could be the steering assist. If not, could be your intermediate shaft.

Grab a flashlight and look at the back of the engine down towards the ground in the driver side. You should see a U-Joint. If it has red-brown-rust colour, that's your culprit.

So I jacked it back up and it’s gone.
 

Did you get it aligned? If it wasn't exactly where it was before the wheels may be off and working against each other. If you are at 100k and haven't replaced that intermediate shaft I would cause it's only a matter of time before it fails. Newer ones have a better design and you don't want it failing at a bad time.

I 'may' replace the intermediate shaft on my 06 SS NA because I can see the rust around the U joint. But when I did the same job and removed it on the SS SC it was a bear of a job. Picture shows it as superficial and it works ok so...it's not an emergency yet.

https://cimg0.ibsrv.net/gimg/www.cob...8ea2818d59.jpg


Sanding, clean up and a spray of rust protective paint might happen when the engine arrives.

Thanks Nova SS I didn't realize at 100K time was up on these shafts.