This is copied from Denny's Driveshaft..
Neapco N3-3-2431X
1350 Series 32 spline T-400, 4L80, 4L85, 6L80 Transmission Slip yoke
Replaces the truck style bolt on yoke with a normal car style slip yoke which will allow for proper slip travel and bushing contact for best performance. A must have when using any T-400, 4L80, 4L85, 6L80 truck transmission with the threaded hole in the output shaft.
With this counterbored slip yoke you can now use a normal car style driveshaft.
- Length to center of u-joint... Dimension #1 = 5.50 inches
- Barrel Diameter... Dimension #2 = 1.886 inches
- Barrel Length... Dimension #3 = 3 1/4 inches
- U-joint cap diameter... Dimension #4 = 1.188 inches
- U-joint width... Dimension #5 = 3.625 inches
- Series... 1350
- Spline count... 32
- Counterbore...1.480 inches
- Counterbore Depth ....0.500 inches