Put The Tranny In 1st Gear. Turn The Input Shaft Exactly One Turn.
Easiest Way To Do This Is Put A Paint Mark On The Input Shaft And The Slave Cylinder And Turn Until They Line Up Again. Put A Mark On The Output Shaft And The Seal. When The Input Shaft Is Turned, The Output Shaft Should Turn Exactly A Quarter Turn For A 89-93 Tranny. If It Is A 94-5, It Will Turn .3 Turns- Not Much More, But Discernable If You Mark It And Look