Re: [Chrysler300] Powersteering fluid

["John Sager cleanthegarageout@xxxxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx>]

My understanding is that PS fluid is closer to, if not, a hydraulic pump fluid, like you would use in hydraulic systems, except it has some additives to not break down with high temperatures.

Transmission fluid is similar in that it's a hydraulic fluid, but it also contains additives they refer to as "friction modifiers" so the internal clutches don't slip. It also has the high  temperature additives and I believe it also has a detergent additive. 

A Chrysler engineer once explained to me the difference between Dexron (spec'd for Chrysler products, similar to "Type A") and "Type F" that Ford spec'd for their cars. The Type F had more friction modifiers in the fluid and using it in a Mopar trans would make the clutches slip less and gave a firmer shift. He was recommending it for any serious performance or race car and actually said that the trans clutches would actually last a little longer. In a southern drawl, he said "But you don't want it in Mommy's Imperial because you can feel it shift". 

Fun fact, if you run out of speedy dry, it's winter time and you dump a drain pan of trans fluid on your shop floor, snow does a pretty good job of absorbing the spilled fluid. You end up with a pile of red snow, and that's probably not real environmentally friendly these days, but it works. 

John

On Saturday, September 19, 2020, 10:47:16 PM EDT, Ray Melton rfmelton@xxxxxxx [Chrysler300] <chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

 

Hello All -

When I was restoring my late father's 1957 300C, I am pretty sure that I was told by several on this listserver to use "any ATF", so I even sucked out some of the ancient fluid in the reservoir and saw that it was actually fairly dark, with a pinkish cast.  I then refilled with Castrol generic pink ATF labeled "for use in most automatic transmissions" - no Type designation.  Power steering now seems to work fine with no leaks, but now I am wondering whether I should try to replace the new pink ATF with a generic "Power Steering Fluid" from AutoZone or Pep Boys, etc.  I am rather dismayed to learn of a PS Fluid label advising "do not use in transmissions", since one of the main components of an automatic transmission is a PUMP!  If PS fluid is OK for the pump in a PS application, why would it not be applicable to the pump in a transmission application??  What is the origin of the advice against mixing PS fluid with ATF (although it could easily make sense, but I would like to know the REAL reasons and source.).   If the strong consensus is that I should totally replace the ATF currently in there, what is the suggested best way to get ALL the old stuff out?  I could probably suck a little of it out of the reservoir, but I know there will still be quite a bit left in the steering box and high-pressure hose.  If I then put in the new  "Power Steering Fluid", I am certain that I will be mixing some new fluid with the residual ATF, and can't think of a good way to get 100% new fluid all through the system.

Any firsthand experience?  Advice and rationale are welcomed.

Ray Melton  Las Cruces, NM  1957 300C  cvt

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On 9/19/2020 6:48 AM, dverity@xxxxxxxxxxx [Chrysler300] wrote:

 

Power steering fluid.

Don

 

From: mailto:Chrysler300-noreply@xxxxxxxxxxxxxxx

Sent: Friday, September 18, 2020 11:52 PM

To: mailto:Chrysler300@xxxxxxxxxxxxxxx

Subject: [Chrysler300] Powersteering fluid

 

 

Hello group

What type of oil should be used for power steering when changing oil?

/Tomas Turovaara

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Posted by: John Sager <cleanthegarageout@xxxxxxxxx>

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