Final Axle Ratio 3.54 2000 Dodge 2500 5.9L Cummins 2WD Axle     RPM=65MPH  Tire Diameter (Inches)
Tire Diameter 31.0 "         25       26       27       28       29       30       31       32       33       34       35           36           37           38           39           40
55 MPH = 1,541 RPM   AxleRatio 3.08  1,965  1,889  1,819  1,754  1,694  1,637  1,585  1,535  1,489  1,445  1,404      1,365      1,328      1,293      1,260      1,228
65 MPH = 1,821 RPM   3.54  2,258  2,172  2,091  2,016  1,947  1,882  1,821  1,764  1,711  1,661  1,613      1,568      1,526      1,486      1,448      1,412
  5th 4th 3rd 2nd 1st   3.73  2,380  2,288  2,203  2,125  2,051  1,983  1,919  1,859  1,803  1,750  1,700      1,653      1,608      1,566      1,525      1,487
NV4500 Trans 0.73 1.00 1.67 3.04 5.61   4.10  2,616  2,515  2,422  2,335  2,255  2,180  2,109  2,044  1,982  1,923  1,868      1,816      1,767      1,721      1,677      1,635
3.9L Cummins RPM MPH MPH MPH MPH MPH   4.89  3,120  3,000  2,889  2,785  2,689  2,600  2,516  2,437  2,363  2,294  2,228      2,166      2,108      2,052      2,000      1,950
ISB170 1,800 64.2 46.9 28.1 15.4 8.4   5.88  3,751  3,607  3,473  3,349  3,234  3,126  3,025  2,931  2,842  2,758  2,680      2,605      2,535      2,468      2,405      2,345
  2,000 71.4 52.1 31.2 17.1 9.3  
  2,200 78.5 57.3 34.3 18.9 10.2  
  2,400 85.7 62.5 37.4 20.6 11.1  
  2,600 92.8 67.7 40.6 22.3 12.1  
  2,800 99.9 72.9 43.7 24.0 13.0  
  3,000 107.1 78.2 46.8 25.7 13.9  
   
   
FtLbs 350 5th 4th 3rd 2nd 1st  
RPM 2,000 256 350 585 1,064 1,964 FtLbs
   
FtLbs 310 5th 4th 3rd 2nd 1st  
RPM 2,500 226 310 518 942 1,739 FtLbs
   
FtLbs 251 5th 4th 3rd 2nd 1st  
RPM 3,000 183 251 419 763 1,408 FtLbs
               
Final Axle Ratio 3.08 GM/ Dana 44 Axles        
Tire Diameter 33.0 "  
55 MPH = 1,260 RPM  
65 MPH = 1,489 RPM  
  5th 4th 3rd 2nd 1st  
3.9L Cummins RPM MPH MPH MPH MPH MPH  
ISB170 1,800 78.6 57.4 34.4 18.9 10.2  
  2,000 87.3 63.7 38.2 21.0 11.4  
  2,200 96.1 70.1 42.0 23.1 12.5  
  2,400 104.8 76.5 45.8 25.2 13.6  
  2,600 113.5 82.9 49.6 27.3 14.8  
  2,800 122.3 89.2 53.4 29.4 15.9  
  3,000 131.0 95.6 57.3 31.5 17.0  
               
Final Axle Ratio 3.54 2000 Dodge 2500 5.9L Cummins 2WD Axle    
Tire Diameter 33.0 "  
55 MPH = 1,448 RPM  
65 MPH = 1,711 RPM  
  5th 4th 3rd 2nd 1st  
3.9L Cummins RPM MPH MPH MPH MPH MPH  
ISB170 1,800 68.4 49.9 29.9 16.4 8.9  
  2,000 76.0 55.5 33.2 18.2 9.9  
  2,200 83.6 61.0 36.5 20.1 10.9  
  2,400 91.2 66.6 39.9 21.9 11.9  
  2,600 98.8 72.1 43.2 23.7 12.9  
  2,800 106.4 77.7 46.5 25.5 13.8  
  3,000 114.0 83.2 49.8 27.4 14.8  
               
Final Axle Ratio 3.73 GM & Dana 44 Axles        
Tire Diameter 33.0 "  
55 MPH = 1,525 RPM  
65 MPH = 1,803 RPM  
  5th 4th 3rd 2nd 1st  
3.9L Cummins RPM MPH MPH MPH MPH MPH  
ISB170 1,800 64.9 47.4 28.4 15.6 8.4  
  2,000 72.1 52.6 31.5 17.3 9.4  
  2,200 79.3 57.9 34.7 19.0 10.3  
  2,400 86.5 63.2 37.8 20.8 11.3  
  2,600 93.7 68.4 41.0 22.5 12.2  
  2,800 101.0 73.7 44.1 24.2 13.1  
  3,000 108.2 79.0 47.3 26.0 14.1  
               
Final Axle Ratio 4.10 Late Dodge 2500 Axles        
Tire Diameter 35.8 "  
55 MPH = 1,544 RPM  
65 MPH = 1,825 RPM  
  5th 4th 3rd 2nd 1st  
3.9L Cummins RPM MPH MPH MPH MPH MPH  
ISB170 1,800 64.1 46.8 28.0 15.4 8.3  
  2,000 71.2 52.0 31.1 17.1 9.3  
  2,200 78.4 57.2 34.3 18.8 10.2  
  2,400 85.5 62.4 37.4 20.5 11.1  
  2,600 92.6 67.6 40.5 22.2 12.0  
  2,800 99.7 72.8 43.6 23.9 13.0  
  3,000 106.8 78.0 46.7 25.7 13.9  
   
               
Final Axle Ratio 4.89 PW Hi Speed Gears        
Tire Diameter 42.0 "  
55 MPH = 1,571 RPM  
65 MPH = 1,857 RPM  
  5th 4th 3rd 2nd 1st  
3.9L Cummins RPM MPH MPH MPH MPH MPH  
ISB170 1,500 52.5 38.3 23.0 12.6 6.8  
  1,750 61.3 44.7 26.8 14.7 8.0  
  2,000 70.0 51.1 30.6 16.8 9.1  
  2,250 78.8 57.5 34.4 18.9 10.2  
  2,500 87.5 63.9 38.3 21.0 11.4  
  2,750 96.3 70.3 42.1 23.1 12.5  
  3,000 105.0 76.7 45.9 25.2 13.7  
   
               
Final Axle Ratio 5.88 PW Low Speed Gears        
Tire Diameter 51.0 "  
55 MPH = 1,556 RPM  
65 MPH = 1,839 RPM  
  5th 4th 3rd 2nd 1st  
3.9L Cummins RPM MPH MPH MPH MPH MPH  
ISB170 1,500 53.0 38.7 23.2 12.7 6.9  
  1,750 61.9 45.2 27.0 14.9 8.0  
  2,000 70.7 51.6 30.9 17.0 9.2  
  2,250 79.5 58.1 34.8 19.1 10.3  
  2,500 88.4 64.5 38.6 21.2 11.5  
  2,750 97.2 71.0 42.5 23.3 12.6  
  3,000 106.0 77.4 46.4 25.5 13.8