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

[retromobilia@xxxxxxxxxxx]

Bill, You probably drove in the middle of the night as I did so you are partly correct. Especially in Texas, US360 By-passing Dallas to the AZ Border. But the south and midwest had lots of hills and turns and traffic...not to mention many "depedy sherifs" and 'Revanewrs'. 
If the 3rd gear tranny was 1:1 what was the final drive ratio if the Diff ratio was 3.34:1. Do the math... Every car I owned in the 50's and 60's which had a tachometer showed 3000 RPM at 60 MPH with the exception of the Catalina tri-power with 3.90 diff, it turned 4000 at 60mph. I do not know where you get your figures from. And, I had a 427 vet in 1966 that turned 4300 rpm at between 110 - 115 (on the same roads you spoke of) and it had a 2.70:1 Diff ratio. I think the 4th gear was also 1:1 or it may have been .97:1,I am not certain, close ratio though it was. I remember the temp would start to rise close to 115. The 4 2 7 /4 0 0, did not like r's..... 


retro car fun, 
JD 
----- Original Message -----
From: "Bill Huff" <czbill@xxxxxxxxxx> 
To: retromobilia@xxxxxxxxxxx, "Rich Barber" <c300@xxxxxxx> 
Cc: "Chrysler300" <Chrysler300@xxxxxxxxxxxxxxx> 
Sent: Sunday, August 28, 2011 10:05:49 AM 
Subject: Re: [Chrysler300] Rear End 300F-fUN WITH NUMBERS 

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" < 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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