Hurst Driveline
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Hurst Driveline Conversions RPM Calculator

Use this calculator to determine your RPM at a specific speed based on your final drive ratio and tire size!

Please select part number below to compute your RPM

Part Number Model Torque Rating Input Spline 1st2nd3rd4th5th6thReverse
1352-000-251 T-5 Ford 300 ft/lbs 10 2.951.941.34 10.63 N/A2.76
TCET4615 TKO-500 (Ford) 500 ft/lbs 10 3.271.981.34 10.68 N/A3
TCET4616 TKO-500 (GM) 500 ft/lbs 26 3.271.981.34 10.68 N/A3
TCET4617 TKO-600 (Ford) 600 ft/lbs 26 2.871.891.28 10.82 N/A2.56
TCET4618 TKO-600 (GM) 600 ft/lbs 26 2.871.891.28 10.82 N/A2.56
TCET5008 TKO-600 (Ford) 600 ft/lbs 26 2.871.891.28 10.64 N/A2.56
TCET5009 TKO-600 (GM) 600 ft/lbs 26 2.871.891.28 10.64 N/A2.56
TCET5201 TKO-500 (Ford) 500 ft/lbs 26 3.271.981.34 10.68 N/A3
TUET11009 T-56 Magnum, (GM) 700 ft/lbs 26 2.661.781.3 10.8 0.632.9
TUET11010 T-56 Magnum, (Ford) 700 ft/lbs 26 2.661.781.3 10.8 0.632.9
TUET11011 T-56 Magnum, (Ford) 700 ft/lbs 26 2.972.11.46 10.74 0.52.9
TUET11012 T-56 Magnum, (GM) 700 ft/lbs 26 2.972.11.46 10.74 0.52.9
TUKT12019 T-56 Magnum XL, (GM) 700 ft/lbs 26 2.661.781.3 10.74 0.52.9
TUKT12021 T-56 Magnum XL, (Ford) 700 ft/lbs 26 2.972.11.46 10.8 0.632.9

Please select a part number first!  
Result
Final Drive Ratio
High Gear
Low Gear Ratio
Input 1
Enter TIRE Width (MM)
Enter Aspect Ratio (1-100)
Enter Wheel Size (Inches)
Input 2
Enter Cruise Speed, MPH
Enter Final Drive Ratio
Please select a part number above and complete the input fields to see the results of your RPM below.
Overall Wheel Diameter, IN
Wheel Radius, IN
Wheel RPM @ Entered Speed
Driveshaft RPM @ Entered Speed
Engine RPM, High Gear, For Selected Trans
High Gear
Engine RPM, High Gear, For Muncie M20
Percent Reduction in RPM
Equivalent Final Drive Ratio, For 1st Gear, As Compared to a 2:52 1st Gear Ratio