my 88 civic has a 4speed manual transmission, i do alot of interstate driving and i dont like how the car only has 4speeds. i'd like to put a 5speed motor to my d15, but i dont know what kind of transmissions will work. thanks..... i also have no problem changing out hubs/axles if i need to to make a 5speed tranny work, basically i just need to know what i need.

 

if you want some more speed, get an 88 si tranny. if you want 5 gears and slightly better highway mileage, get a 88 dx tranny. if you upgrade the clutch you can run an 89-91 tranny also....you would have to get an 98-91 flywheel i believe and the clutch to go with it.....but its kinda worth it. the 88 clutch is smaller.

 

If you go to a junk yard, brong your clutch disk with you b.c they never know what trannies they have...

 

what do you mean by changing the clutch? did they change the setup between 88 and 89? like from a cable to hydraulic? thanks

 

No the 88 Clutches had 21 splines on the imput shaft, the 89-91 had 20 splines.