Spicer 260 u-joint average torque rating of 2900 lbs-ft. Spicer 297 u-joint average torque rating of 4400 lbs-ft. 27 spline / 1.16-inch diameter axle shaft maximum torque rating of approximately 4100 lbs-ft. 30 spline / 1.31-inch unit maximum torque rating of approximately 6000 lbs-ft