Sonnax Slip yokes are made of forged chromoly . They add strength and durability at an affordable price. The T3-3-2491HP uses 1350 series u-joints, and fits several applications, including most TREMEC T-56 Magnum and TKO500/600, FMX, C6, ZF 5-speed transmissions. Whether your using these for street car, street rod, drag or dirt, these deliver strength and reliability for high horse power and maximum torque capacity. 31 Spline Count Length: 7.320"