Hy guys im kinda newbie here but i'm learning just as always. 
  
i recently bought a 93 justy 4x4 push buttom manual transmition. 
  
it has come to my mind that in this car the 4th and the 5th gear are very much alike, and since i travel like 500 miles (once a week) at a speed of 80mph to have 5k on the tacho in 5th gear makes no cheap tripp. 
  
so i have to ask this. Can i change this gear so that the same 80mph can be achieved with 3.5 to 4k rpm?? 
  
english is not my native tongue so excuse the incoherences. 
  
bye.