Chrysler 727 3-speed automatic vs.
4-speed automatic

New transmission:

4-speed automatic (.70 OD)

1. Pick your tire size:  /  R-

2. Pick your cruising RPMs:

Results: The Best of Both Worlds!

Low Gear Acceleration AND Low RPM Cruising!

1st Gear Comparison

Final Gear Comparison

Stock
Differential
Ratio

Automatic

Accelerates like:

Stock
Final Gear

Automatic
Overdrive

rear

mph

mph

rear

mph

mph

rear

mph

mph

rear

mph

mph

rear

mph

mph

rear

mph

mph

rear

mph

mph

rear

mph

mph

Rolling diameter for selected tire:    inches

Gear Set:

Horsepower:

Chrysler 727 Gear Set: 1st=2.45:1; 2nd=1.45:1, 3rd=1:1, 4th=n/a
4-speed Auto. Gear Set: 1st=3.06:1, 2nd=1.63:1, 3rd=1:1, 4th=.70:1