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

[retromobilia@xxxxxxxxxxx]

In my recollection, over the years, most all brands of american cars had a three speed trans. (auto and standard) and had a 1:1, 3rd speed ratio (pre 4 spd overdrive automatics). And at 60 MPH they were all turning around 3000RPM (all brands and models). 



Keep in mind that the super highway system was still mostly a dream in 1960. It was very difficult on US hiways to drive more than 60 for any consistent period of time. (2 way roads with trucks doing 45 - 55 mph were the norm). One needed the mid range power for passing and it was only for very short distances that one could drive over 60 MPH. 


In concept, the diff. ratios in the area below 3.00:1 (such as 2.70:1) were for city traffic such as taxi and limos. It was later when Gas became scarce and prices shot up and long hiway interstate drives were designed for 70MPH and Over-Drive slushboxes became the norm that many people were looking for a way to make long legs out of a car with a, red line RPM, at 4300 to 4800. Anything with 3.90 to 4.11 was considered to be for drag-racing or (by manufactures for mountain use). John 
----- Original Message -----
From: "Rich Barber" <c300@xxxxxxx> 
To: "jean-yves chouinard" <jymopar@xxxxxxxxxxxxxxx>, chrysler300@xxxxxxxxxxxxxxx, "Thomas Cox" <tdcox@xxxxxxxxxxxxx> 
Sent: Saturday, August 27, 2011 11:31:47 PM 
Subject: RE: [Chrysler300] Rear End 300F-fUN WITH NUMBERS 






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 
Sent: Saturday, August 27, 2011 4:27 PM 
To: chrysler300@xxxxxxxxxxxxxxx ; Thomas Cox 
Subject: Re: [Chrysler300] Rear End 300F 

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. 

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