Does anyone now if a 5spd tranny from a 4dr will work on the 1.6l sohc 5spd in my 1989 civic si canadian model?

 

yes it will work

 

ok but is it suggested? will it change anything or be beneficial?

 

well, youre talkin about using a 5 speed tranny from a 4 door civic, which means its either an EX or LX tranny. you currently have an SI motor, so more than likely you currently have an SI tranny. i can tell you right now that the LX/EX trannys have longer gear ratios than the SI which means slower acceleration, but better gas mileage. so you might see a decline in performance but an increase in gas mileage.

 

i beleive it is only the final drive gear that is different, do you kinow if it is very hard to change the final drive only, or should i just rebuild my si trany that has a bad output shaft bearing and a leaking seal?

 

god damn man, this is the second post i've read where you've given the wrong info.

for one, there is such a thing as a DX four door ya know, so he could be getting a DX tranny.

EX tranny is identical to the Si.
DX/LX are the same trannies.