Sonnax Slip yokes are made of forged chromoly . They add strength and durability at an affordable price. The T3-3-5571HP uses 1350 series u-joints, and fits several applications, including most 4l80/85e, 6l80E, & TH400 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. 32-Spline Length - 7.810 in.