Spicer Driveline Installation Service Manual - Manual (Page 5)

2
Installation Techniques
Driveshaft T
orque
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?
How to Calculate Torque:
LGT = T x TLGR x TE x SR x TCR x C
How to Calculate Wheel Slip:
WST = (.71 x W x RR) / (11.4 x AR)
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.
LGT = Maximum Driveshaft Low Gear Torque SR = Torque Converter Stall Ratio (if applicable)
T = Net Engine Torque or 95% of the Gross Engine Torque TCR = Transfer Case Ratio (if applicable)
TLGR = Transmission Low Gear Ratio (forward)* C = Transfer Case Efficiency (if applicable, 0.95)
TE = Transmission Efficiency (automatic = 0.8; manual = 0.85)
WST = Wheel Slip Torque Applied to the Driveshaft RR = Tire Rolling Radius (in)
W = Axle Capacity (lbs) AR = Axle Ratio
Engine
Trans.
Axle