Originally Posted by Bolerpuller
its so far up I can't reach it. (Special tool?)
Originally Posted by mary and bob
You could probably get the lines disconnected from the faucet assembly using a basin wrench, but I don't know how you would connect them to a new faucet if you can't reach it.
If you cannot replace the faucet seats, the part that remains inside the faucet after you remove the cartridge shown in the third photo, then a new 4-inch center faucet might be in order. The seats generally require a hex wrench to remove.
If you need to replace the faucet, look into basin wrenches. That should serve to remove the pesky thing.
Installing may be more challenging because you need to hold the hex surfaces on the "nuts" while getting them started. If you can't reach up there to at least get the new fasteners started, maybe a kid with smaller hand and arms could help to reach up and get them started - ?
Other than that, maybe you can get creative and tape the fitting nuts to the basin wrench with blue tape or something that will hold them enough to get the nuts started on the threads but release itself when you apply more force to tighten them down.
Another approach might be to connect different pigtails which are easier to connect to the faucet, then connect the pigtails to the existing piping lower down.
It looks like it will be a challenge; I hope you find something that works out for you.