Road Speeds per 1000 rpm            assuming 10" dia wheels
differential ratio                            MPH per 1000 rpm in 4th gear
3.44:1                                              16.47 (25.7 kmh)
3.647                                               15.0    (24.14 kmh)
3.765                                               14.7 (23.5kmh)
3.94:1                                              14.1 (22.6 kmh)
4.133:1                                            13.4 (21.4 kmh) 
4.26:1                                              12.96 (20.75 kmh)
4.35:1                                              12.6 (20.2 kmh) 

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