This U-joint goes from 1"-48 spline to 3/4"-20 spline. Howe's codes for the ends are 18 and 21.
- End 1: 1"-48 spline (code 18)
- End 2: 3/4"-20 spline (code 21)
Match your shaft splines against the ends listed in the specs before you order.
Howe Performance part number UJ-1821.