Re: [Chrysler300] 300 F axle ratios.
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Re: [Chrysler300] 300 F axle ratios.

All automatic transmissions shift based on output shaft speed. That is where the governor is located, which controls shift speed. Throttle pressure also plays a part. Light throttle, quick shift. Max throttle, max shifts. The 1-2 and 2-3 shift valves are not the same size, so the trans is timed to shift before the engine blows up. ALL 727s have a full throttle downshift, even those with the part throttle downshift. Which didn’t come out until 72 on big block 727’s. The whole idea was to not have to floor it when you needed a downshift, but full throttle wasn’t really necessary. If it doesn’t work right, linkage or throttle cable is to blame. 62 valve body is pretty much the same as 63-64 with cable shift. Most of the 300 transmissions had a higher speed governor, along with the other high performance models. Governors with different weights can be bought to tailor the shift speed to the engines power curve.
Sent: Wednesday, October 14, 2015 6:39 PM
Subject: RE: [Chrysler300] 300 F axle ratios.

Once again displaying and acknowledging the many gaps in my knowledge and experience, I never was much of a drag racer on a timed strip but perhaps the reason for decent performance from a numerically-low differential ratio in a letter car is that one can stay in the lower gears to higher speeds.  On its own in WOT mode, I think the tranny shifts more based on engine speed than tail shaft speed.  Controlled by the driver, I would expect the shifting to begin at an RPM where the power curve starts to flatten.  With a TorqueFlite, 2.93 axle and 29” OD tires, one could get 60 MPH in low and 101 MPH in second at 5000 RPM tail shaft speed.  That ought to just about do it for the quarter mile in any letter car.  Does anyone have additional documented time and speed values for letter cars on the ¼ mile strips?  Numerically low stay in second through the quarter?  Numerically higher finish in high gear?

Rich Barber

Brentwood, CA 90+ in the shade today.

From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of alan miller alangmiller22@xxxxxxxxxxx [Chrysler300]
Sent: Wednesday, October 14, 2015 12:10 PM
To: John Grady <jkg@xxxxxxxxxxxxxxxxx>; 'Michael Reed' <rmreed@xxxxxxxxx>; 'Gary Barker' <gbarker@xxxxxxxxxxxx>
Cc: 'Noel Hastalis' <cpaviper@xxxxxxxxxxx>; 'Chrysler 300 Club Intl.' <chrysler300@xxxxxxxxxxxxxxx>
Subject: RE: [Chrysler300] 300 F axle ratios.


Hey Guys, Back in '67 I drove my 'F' once at Fremont Drags. Using 2.93 gears, turned a16.38, slow, but not bad I thought. Hot Rod Magazine had a road test showing 16 flat, 7 years earlier. I don't remember their axle ratio maybe someone out there has the issue. I'm sure all of you remember 6 seconds to 60 mph was considered a pretty good acceleration time, and about 7 sec. for our Brutes, but a Cobra 5.5 seconds, WOW! 

Times have in 2015 my Wife's car.... 2.9 to 60. We are having the time of our lives!  Alan

To: rmreed@xxxxxxxxx; gbarker@xxxxxxxxxxxx
CC: cpaviper@xxxxxxxxxxx; Chrysler300@xxxxxxxxxxxxxxx
From: Chrysler300-noreply@xxxxxxxxxxxxxxx
Date: Wed, 14 Oct 2015 14:27:45 -0400
Subject: RE: [Chrysler300] 300 F axle ratios.


He had 9” Le Car wheels….easy!


From: Michael Reed [mailto:rmreed@xxxxxxxxx]
Sent: Wednesday, October 14, 2015 7:16 AM
To: Gary Barker
Cc: Noel Hastalis; John Grady; Chrysler 300 Club Intl.
Subject: Re: [Chrysler300] 300 F axle ratios.

You surprised me on that one, Gary! Drag racing with a 3.31 RAR?!! That would seem to me to uncompetitively long gear ratio, unless you weren't really serious. I don't recall anyone, even in the NHRA stock classes back in the 60s and early 70s, running anything taller than 3.90. Most were running 4.11s or 4.56s, some 5.12. My daily driver/weekend SuperStocker had a 4.56.

I drive to the strip these days also, 4.11 gears.

Mike Reed in Hastings, Michigan

----- Original Message -----

Sent: Wednesday, September 30, 2015 3:09 PM

Subject: Re: [Chrysler300] 300 F axle ratios.

When I was drag racing my Dodge at Lyons Drag Strip in 1960,  I went from 2.93 to 3.31.  at that time The dealer had no listing for a 3.18 when I bought my gears.   Gary Barker


Posted by: <dverity@xxxxxxxxxxx>

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