gearbox synchronizer
 

hi every one ,
I hope you could answer me with this matter , many people say things I don't understand about 280zx transmission which have numbers like 19 , 21 and 22 .
what these numbers mean ?
I want to know about the 280zx , what dose gearbox synchronizer mean ?

The only thing I can think of from those numbers is speedo cogs? As far as the synchros go, google how they work. But yes it is a synchro gear box of course.