im wanting to change 5th gear in my 88 hp 2.5 ajt 1999. The box that is fitted is from a 2.4 non turbo which pulls great but top end motorway speed is SLOW !! I did have the old box till it was swipped off my drive !! can anyne tell me what parts i need ?? or even better do yo have them ?? the origanal 5th is fine but a little longer would be great as i plan more power !!