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

[Bill Huff <czbill@xxxxxxxxxx>]

I don't know about other areas, but in the late 
50's onward there were literally thousands of 
miles of straight, uncrowded roads in Texas, 
Arizona, NM, etc.  I spent  hours on end doing 
70, 80, even 90 mph in semi trucks on those 
highways, before the interstate system came 
along.  They weren't superhighways but they also 
were quite straight and not very crowded.

In those days I drove some older cars, many of 
them had overdrive behind the 3 speed standard 
and would cruise comfortably at 65-70 mph.  Those 
cars probably had rear end ratios in the high 
3's.  My 58 DeSoto with 350 engine would cruise 
easily at 70 mph.  My Dad's 59 Ford wagon with 
292 engine would reach 95 mph in second gear and 
was very comfortable at 70 mph.  All those are 
indicated of course, no telling what actual speed 
was but it was all we had to go by.  I think it 
was HP that allowed the lower gear ratios rather 
than the highways.  A V-8 with more torque and HP 
could still accelerate faster with a lower ratio 
than an older inline car with a higher gear 
ratio, and could cruise at a comfortable RPM as well.

Bill Huff



At 8/28/201111:05 AM, retromobilia@xxxxxxxxxxx wrote:
>
>
>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" <<mailto:c300%40ez2.net>c300@xxxxxxx>
>To: "jean-yves chouinard" 
><<mailto:jymopar%40nb.sympatico.ca>jymopar@xxxxxxxxxxxxxxx>, 
><mailto:chrysler300%40yahoogroups.com>chrysler300@xxxxxxxxxxxxxxx, 
>"Thomas Cox" <<mailto:tdcox%40bellsouth.net>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: 
><mailto:Chrysler300%40yahoogroups.com>Chrysler300@xxxxxxxxxxxxxxx 
>[mailto: Chrysler300@xxxxxxxxxxxxxxx ] On
>Behalf Of jean-yves chouinard
>Sent: Saturday, August 27, 2011 4:27 PM
>To: 
><mailto:chrysler300%40yahoogroups.com>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: 
><mailto:chrysler300%40yahoogroups.com>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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