Hey guys, i have a 89 si tranny that i want to use with my d16z6 swap in my 91 dx hatchback....... will everything work since the tranny is a 89 and the car is a 91?

Thanks

 

yes it will bolt on and work perfectly

 

Ok , i just thought there was something different about the imput shaft, does anybody kno anything about that?

 

also, does anybody know how many teeth the 4.25 SI final drive should have compared to the 3.88 dx final drive??

 

yea i just swaped a d16z6 in my crx and i still with the same si 89 tranny so yeas you can use it

 

need 89 clutch components and flywheel

 

whats different about the flywheels and clutches from 89-91?

 

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/stock-clutch-fitment-guide-2284956/

mostly flywheel diameter

 

use the 91 flywheel and clutch - the transmission you use with the larger 90-91 flywheel and clutch doesn't matter as long as the transmission isn't 88 model - all 89-91 transmissions will work with any 89 clutch and flywheel or any 90-91 clutch and flywheel

 

Correctomundo! Yeah I had a 89 si tranny with a d15b vtec in my 91 dx, used my 91 dx clutch and flywheel on it, everything worked fine. It's sitting in my garage now only cause the diff broke in it, but that's my fault.

 

oo ok nice.....can i use my 91 d15b2 flywheel or does it have to be a si flywheel?

 

your DX flywheel is the same as the Si flywheel

 

it also depends on what clutch he is using

 

the Si Final Drive has 16 teeth on the countershaft and 68 teeth on the ring gear -
the DX Final Drive has 18 teeth on the countershaft and 70 teeth on the ring gear

 

so if i use my d15b2 flywheel should i just get a stock replacement 91 dx clutch?

Also if you have done this swap, how did you like it?

 

you can use the clutch that is already on the car if it's not bad. That's what I did. It was just fine for four years with my d15b vtec. When I swapped the d15b vtec out when I hydrolocked it, the clutch had wear around the springs so I put another clutch in.

I have a zc vtec in there now, which is basically a d16z6. I like that swap, I like it better than my d15b vtec. Mainly for the torque, I used to have to downshift my d15b vtec down to third gear when exiting onto an onramp. With my zc vtec I can keep it in 5th if I want and it won't act like it's about to bog out on me like the d15b vtec did.

 

21 spline 190mm came in 88 crx/civics
21 spline 200mm came in 86-89 teg/79-87 prelude
20 spline 200mm came in 89 crx/civics
20 spline 212mm came in 90-00 non-b series crx/civics
21 spline 212mm came in 84-87 2.0L Preludes
19 spline 190mm came in 73-80 civics
19 spline 200mm came in 81-87 civics
19 spline 190mm came in 84-87 crx
24 spline 210mm came in 88-89 prelude
24 spline 220mm came in 90-95 prelude non-vtec
24 spline 225mm came in 94-99 prelude vtec