1995 Ford Ranger Power steering draining

I have a huge problem. Ford Ranger 2.3 motor 1995 My power steering unit suddenly started emptying out every 5-10 miles. I gfot a mechanic to look at it, suspecting it had to be one of the two lines underneath the PSU. He said it was the 0-ring that attaches to the reservoir. He convinced me to replace the whole unit instead of monkeying around with just the reservoir. I agreed and we did that. Still leaking and I'm a little peeved. I took it to another garage and it wasn't leaking too bad when I dropped it off but this was only driving it 1/3 of a mile. They had it half a day and when they called me back they said they couldn't find a leak, and maybe I had just over filled it and the slight leaking was just that. I took it for a drive, parked it, it was only dripping a bit, the fluid was at the right level. However, 12 hours later, there's a huge puddle and it's empty! I'm suspecting a crack in the Steering box that swells up and pretty much holds during driving, but widens out when cold. What do you guys think? Also if this gets to be too much of an expense I'm out $180 already, can I just eliminate power steering?