The weight is only part of the high speed governor. There is also a different spring inside. Only Chrysler engineers know why they changed two things and not just one. Mixing and matching to try and see what does what would be a very time consuming process. The best you can do is check governor pressure at the speeds indicated by the manual. Using GPS and driving the car would give the most accurate reading. Governor pressure is controlled by driveshaft speed. Throttle pressure acts against this to vary the shift points according to how much throttle opening there is. Any change in governor weight will affect both 1-2 and 2-3 shift the same way. Individual springs for the shift valves control their shift points.
Throttle linkage adjustment to the trans is very important, as it is strictly a mechanical link. Other transmissions use a vacuum modulator to control part throttle shift points, and a separate system that controls kick down only. Chryslers does both. If your trans shifts at slow speed, and you have no kick down, the linkage is to short. If the shifts are drawn out with light throttle, the linkage is to long. This will also put undo wear on the transmission parts when the valve bottoms in the valve body and the linkage flexes.
Wait. What? The weights are lighter for the 300 TF? My TF (a NYer 1733227) was "brought to 300 specs" many years ago. I wonder if they missed installing the lighter weights as would normally be found in the 300 (1854123) TF. So I might have been getting the lower NYer upshift points all along, and that was the source of my perceived low revs. I'll ask Don to check out that possibility while he has the tail housing open.
And speaking of poor instruments like tachs, how about the C speedometer. That was a stranger goof-up yet. The numbers on the speedo face don't have any relationship to the hash marks behind them, leaving your actual speed to be a guess - unless you use a GPS. Now on top of that, my radial tires have enough of an undersized circumference that my indicated speed (and thus my odo too) is somewhere around 10% higher than my GPS number.
On Mon, Feb 27, 2017 at 5:53 PM, John Grady <jkg@xxxxxxxxxxxxxxxxx> wrote:
Posted by: <dverity@xxxxxxxxxxx>
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