Re: [Chrysler300] Rear End 300F-fUN WITH NUMBERS

[paul <paulholm@xxxxxxxxxxxxx>]

On 8/28/2011 2:31 AM, Rich Barber wrote:
> I've spotted a reference for the 9.00 X 14 tire on the 300F as having an OD
> of 28.68".

> Assuming no slippage:

> MPH=(3,000*Pi*28.68*60)/(3.23*12*5280)=79.2 MPH.

> RPM @ 60 mph=2,273 RPM

> Axle Ratio to give 60 MPH @ 3,000 RPM: 4.26    One reference says the
> available ratios ranged from 2.73 to 3.91.

> From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
> Behalf Of jean-yves chouinard

> I could be wrong here, but isn't the 300F rear end ratio 3:31 to 1 ?
> And the 300G ratio 3:23 to 1??
> I know , not a huge difference...and I agree with Don, 3000 rpm seems high
> at just 60mph...
> Jean-Yves

> ----- Original Message -----
> From: Thomas Cox
> To: chrysler300@xxxxxxxxxxxxxxx<mailto:chrysler300%40yahoogroups.com>
> Sent: Thursday, August 25, 2011 8:48 PM
> Subject: [Chrysler300] Rear End 300F

> At 60 mph, I am running about 3,000 rpm. Is this to be expected with a 3.23
> rear end? I wonder if I have the correct "chunk" in the F rear end.

Side note for comparison purposes:  my 'hot-rod' truck has a 3:55 sure 
grip rear and tall tires, at 60mph it reads between 2400 and 2500 on the 
tachometer.

Now it doesn't really matter a whole lot to me because of all the work 
that went into building 'FrankenTruck'. I expected about that 
circumstance. It doesn't care if its empty or the bed is fully loaded, 
it runs real nice.

Nutter side note.  MANY years ago, about 1974, I junked a 4 door 
NewYorker. One of the things off it that I kept was rear axle assembly, 
complete drum to drum. About 10 years ago I finally decided to dig it 
out and do something with it. Turns out that rear had been played with 
some time before I got it back then. We discovered that it had a 1970 
dated center section, Sure-Grip :-) with a 3:73 ratio.
Needless to say I kept the assembly, a 3:73 ratio 1957 8-3/4" with 
sure-grip sure sounds like it could be fun for playing around with.

-- 
Paul Holmgren
Mine: 2 57 300-C's in Indy
Hers: 05 PT GT R/T HO Stage 1
Hoosier Corps L#6


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