Re: {Chrysler 300} P/s pump difference for 1960

[John Grady <jkg@xxxxxxxxxxxxxxxxx>]

I am interested too , in 300 PS pumps in general   .I second where Dave is going 
I had a rebuilt ps pump in a 57 seize recently, assume  the original 57 style pump , seized 15 minutes after first start of engine, took out belts etc. Lucky in garage  not on toad   . All nice and silver  from rebuilder (done  before I got  the car, never started  ) 
I trust Carmen  at steer  and gear he did  maybe  a  dozen F pumps for me over the years   , no problems ,ever 
The first thing i ever did to a 300F  was figure out a kit using a  shoulder bolt and spacer pipe to get rid of dumb bouncing betty PS mount on F , but F pumps in  general are ok . All mine were  the same . Maybe , Dave , someone changed your pump? 
I think they put out 900 to 1100 psi . The earlier coaxial box ( i know in 57,58 , was it in 55,56 59?) I think 59 had F type pump but not sure .
So I went to rebuild the 57 ( again) at S &G ,brief exchange , Carmen told me 57 pumps are a dog, he has changed them for later " Thompson " pumps on Chryslers . That means nothing to me , ( still means nothing)  maybe they fit the hemi bracket?  
I understand the coaxial pumps ( like 57 ) put out 600-800 psi , not sure what this "Thompson " puts out , so backed off.
In interim I had two other 57 style  pumps in junk pile  , threw  one on it works, but after belt seizure I am wary . But used / broken in might be better , unmessed   with , and  if no seal leaks why not ? Seizure is usually too tight?  Don't rebuild if working  ?   to get new silver paint and new problems is the takeaway  on that . Replace seals? 
 So I have converted several non stock  cars to GM saginaw pump , they  are plentiful and bulletproof. 
I have not seen a dual pulley for  them ( solvable) , two styles fyi   press  on pulley and keyway / nut . May be other variations around metric . 
They put out about 1000 psi . 
But so popular with hot rod guys , Speedway ( add others ) make a replacement pressure regulator that goes to 600 to use with Ford / Mustang 2 racks, . Should work with co axial box 
I have one on a  baby Dodge hemi in a 50  studebaker business coupe ( way cool car), mustang rack  . Fits  in front of head 
Thinking of adapting to 392 with 600 psi setup . 
The pressure regulator is part  of outlet fitting , 2 minutes to change 
Speedway makes  a banjo outlet fitting , it  turns outlet on back 90 degrees, can set  any angle 90 degrees to belt and tight to pump back  That is a Great Idea.! As mopar hemi head is right there  
Maybe some one knows what pumps are  on what years 300 and how they differ or ?whatever ? 
Chrysler used several suppliers , across   car lines, must have had problems , 57 dodges had Vickers pumps  total dog , 600 to rebuild  That car has Saginaw now , brand new Saginaw pumps are under 100 $ 
I get stock , ok,..  but this  data needs organization? And  fitting info etc? 

Good question , Dave  
jkg 

ps, these were early days of PS , driven by GM , many if not most cars had manual steering in late 50's . So one can understand early problems as PS slowly became  the normal set up   Look at Ford,  brutally bad setup with cylinder on the steering  tie rod 

> On Apr 6, 2026, at 11:06 PM, 'dave mason' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:
> 
> 
> Hello all,
> 
> There seems to be two different p/s pumps used in 1960?  Or maybe 1959-1960. Anyone know the difference, in either manufacturing dates or pressure output?  Are both correct for 1960?
> 
> “Older” looking, slightly smaller reservoir, smaller pulley?:
> 
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> 
> 
> More common “Saginaw” pump?:
> 
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> 
> 
> Guessing there might be an output pressure difference?
> 
> Thanks,
> D&K
> 
> Sent from my iPhone
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