I just got my newly rebuilt steering box back from Firm Feel. The power steering fluid I put in this car when I got it last year is Prestone Power Steering Fluid (I think with stop leak). It seemed to work fine. But,

Is the Prestone fluid as good as the next, or is there some special power steering fluid for these cars. I would sure hate to damage my new investment.

Don't use fluid that contains stop-leak. Other than that, use a fluid that is specifically stated as meeting the Chrysler specification.

(ATF is also not an appropriate choice)

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Too many people who were born on third base actually believe they've hit a triple.

Don't mean to be contrary, but factory fill in chryslers these day is atf+4.

True. Also true is that we are not talking about model year 2007 power steering systems in this thread.

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Too many people who were born on third base actually believe they've hit a triple.

Aside from using real power steering fluid, you might consider adding a cooler in the return line. They can really help with a high effort box in the summer.

Not quite sure I understand what you mean when you say a P/S fluid cooler helps with a "high effort" box in Summer...?

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Too many people who were born on third base actually believe they've hit a triple.

Well maybe I should have said any box in the summer. I noticed where he lives and it gets hot up there, like it does down here. I assumed a rebuild from firm feel would be a higher effort box. The higher effort, faster ratio boxes I have used usually ran a little hotter than stock boxes. This may be in part due to higher pressures from modified pump regulators. Higher effort is great but the response can lag without higher pressure. Maybe this is not an issue with the firmfeel setups? I have just found a cooler can help eliminate pump whining and fluid foaming as well as lengthen the fluid life when you use the car in 100 degree plus temps. Especially if you turn corners fast.

I certainly gets hot here in the summer. I looked at Summit, they are only about $24. Maybe it's something I should consider.

I have one of the ones summit sells on our nissan and it works just fine. I have used different types on other cars and they all worked. The Nissan had whining power steering when it got hot, and it was already plumbed with hard lines for a cooler thru the radiator support. They just had a short hose loop connecting the lines. They must have planned for one but dropped it. It occurred to me that you might be in the Redding east of here and not north, but it's even hotter out there. Even if you don't have heat related problems it should be better for the seals to keep it cooler.

A really good power steer fluid to use is Mobilfluid 424.
Its a tractor transmission fluid, and Ford Australia changed to it, because its better than ATF DEX II or IID or III.
I have used it in other makes, Toyota, Mitsubishi, Nissan, and older Fords.
The Ford part number is R1-424.