Howe's UJ-1811 joins a 1"-48 spline shaft to a 13/16"-36 spline shaft, so you can bridge two different shaft ends without an adapter.
- End 1: 1"-48 spline (code 18)
- End 2: 13/16"-36 spline (code 11)
Howe lists this joint family in a long list of spline combinations, so if your ends are different, check the other UJ part numbers.
Howe Performance part number UJ-1811.