Slight plumbing leak in 1930s threaded pipes
Your only real DIY option is to wrap it in Flex Tape. The stuff works and should be good for at least a decade.
Other than that, you'd have to hire a Plumber to turn off the water at the street for a new valve to go in. That's how it was for me, but call your utility and see it they'll do it and wait for you to put in a new valve.
Anyway, the Plumber won't just turn off your water and wait around to turn it back on, they'll demand the whole job...typically.
Just so you know, the Ford will need to be removed and an expansion tank will be added to your water heater assembly...if there isn't one already.
FYI, start saving up now for full replacement of that galvanized out to the street, minimum...it's got maybe 10-years left.
And, NEVER, do PEX. It's plastic and therefore garbage.(period) The inventor admits that chlorinated water was his obstacle and the only way to defeat it was to leach sacrificial toxins to combat it.
See mrpexsystems, it's a hoot of failure. And, NO PEX has been around for 40-years! That's ALL a LIE and is completely confessed that PEX didn't EVER go beyond experiment until 2003.
PEX is only &quot;good&quot; for 25-years and then NEEDS full replacement. Stick with sweated copper for everything and only use a real Plumber that can sweat a joint. I'm just saying.