Can leaking radiator hoses cause problems in the transmission? What else?

I've got a 2007 Ford Explorer Sport Trac, had the radiator replaced last July, needed to take to a closer garage because I was afraid of way transmission was acting. They left a message saying all radiator hoses were original and basically leaking evweywhere. And there's a bunch of other problems. Something with the thermostat. They're trying to figure out if tranny is totalled. Waiting for a call back. Just wondering what problems can ensue with bad radiator hoses.

What causes high rpms when idling?

When I start my 02 Ford Explorer my rpms shoot high then idles real low then goes high then low repeatedly and when trying to put it in drive engine shuts off… Could it do with anything with my catalytic converter or is it my O2 sensor or maybe a vaccum leak?

2002 Ford Explorer clunking noise?

I have a 2002 Ford explorer xlt 4.6l v8. It happened about last week where all of the sudden all 4 wheels will randomly click from accelerating from a stop. The 4 wheels won't clunk at the same time. Just random wheels while accelerating. You can feel it in the car and it pops. It isn't just a slight pop. It is a painful clunk sound.