Hey Tom,
Here is what I've calculated. But I usually just 'putt' around town and not much more that 65 MPH on the open highway. Once the 700R4 is in I can leave it in 3rd, but the Powerglide up-shifts well below my usuall 45 MPH cruise mode.
Input Parameters Are the Following: 700R4
Differential Gear = 3.73 to 1
Transmission Gear = 0.70 to 1
Tire Diameter (Inches) = 28.00..30.0
Vehicle MPH = 65
Computed Engine RPM is 2037.....1902
Input Parameters Are the Following: Powerglide
Differential Gear = 3.73 to 1
Transmission Gear = 1.00 to 1
Tire Diameter (Inches) = 28.00..30.0
Vehicle MPH = 65
Computed Engine RPM is 2911.....2717
