This is a Rotax   (A) type gearbox  , It is 2.58 ratio   and  can be used on a Rotax  277  aircraft engine ,  It can be used in  the UP position  or the down position  your choice      It is brand new  never used and what you see in the pictures is exactly what you will receive if you are the lucky buyer  the   buy it now price is $ 1500. which includes the priority mail shipping to you , Again you just let me know  if  you want to mount it up or down on the Rotax 277 engine  Thanks for looking .