Thanks, Carl. All very clear and well-presented. Just for the exercise, I used my handy-dandy speedo pinion/differential ratio spreadsheet on the 3.91 axle. Turns out the speed in direct drive at 6,000 RPM would “only” be 128.3 MPH on 8.50x14’s. A 22 or 23-tooth speedo pinion would each provide +/- 2% speedometer readings (respectively). The slightly-larger diameter 7.60 x 15’s on the J’s would provide about 2% higher speed at the same engine RPM and tranny ratio. If the 1963 3-speed stick had a 1.49 second gear, 6,000 RPM on the engine would give one 86.1 MPH in second gear. Much more a dragster than a land-speed record contender. The 1.39 third gear in a four-speed would get one 92.3 MPH @ 6,000 RPM. It would be interesting to hear from those High-T guys who drag-raced their 4-speed 300K’s as to whether they had to shift to fourth in the quarter mile. I’m guessing not. I would guess the three-speed manual would have had to be shifted to high. The 3-speed TorqueFlite with the 1.45 second gear would give one 88.5 MPH in second gear at 6,000 RPM—may or may not need that slam-bang 2-3 shift near the end of the quarter. The current five to ten-speed transmissions certainly offer the potential of keeping an engine at optimum speed and torque levels for desired results—be it emissions or performance. I’m seeking another level of precision and could use the actual number of teeth on drive and driven gears in the various trannys. I have them for the various differentials and speedometer pinions. The table below is from the 1964 Service Manual.
Best wishes for a good old Iowa Christmas. Rich Barber Iowa Expatriate From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Carl cbilter@xxxxxxxxx [Chrysler300] Rich and all: __._,_.___
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