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Driveshaft Torque
The following problems are usually a result of torque overloads:
Twisted driveshaft tube
Broken yoke shaft, slip yoke, tube yoke, flange yoke, end yoke
Broken journal cross
How much torque can be generated in your application?
Engine
Trans.
How to Calculate Torque:
LGT = T x TLGR x TE x SR x TCR x C
LGT = Maximum Driveshaft Low Gear Torque
T = Net Engine Torque or 95% of the Gross Engine Torque
TLGR = Transmission Low Gear Ratio (forward)*
TE = Transmission Efficiency (automatic = 0.8; manual = 0.85)
How to Calculate Wheel Slip:
WST = (.71 x W x RR) / (11.4 x AR)
WST = Wheel Slip Torque Applied to the Driveshaft
W = Axle Capacity (lbs)
For On Road Applications
Relate the lesser of above to Spicer universal joint ratings. If your torque exceeds the Spicer rating for the universal joint used in
your application, switch to a size with a rating compatible to your calculation. However, the series selected cannot be more than
one series below the series called for by the LGT calculation.
For Off Road or On-Off Road Applications
Use Low Gear Torque value only to verify or switch to a size with a rating compatible to your calculation.
Installation Techniques
SR = Torque Converter Stall Ratio (if applicable)
TCR = Transfer Case Ratio (if applicable)
C = Transfer Case Efficiency (if applicable, 0.95)
RR = Tire Rolling Radius (in)
AR = Axle Ratio
Axle
2
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