i'm rebuilding a d16a6 for my 91 dx hb but i still gotta go find an Si tranny for it. i know there are posts just like these but will someone explain why the dx axles won't work if you put in an Si tranny?? if the DX axles will work in a ZC tranny, why not the Si tranny?? I or we, really need a straight answer from someone who installed an Si tranny into their dx without having to change the existing axles...

i heard you have to change the hubs too??? it doesn't make sense whats the difference between the Si hubs/axles and the DX hubs/axles????

 

Well lets get this straight. You say you have a dx but in your sig it says that you have a Standard? It does matter which one you have so let us know

 

sorry but i didn't wanna explain the car is std model when i bought it but when i looked at the engine code, it said D15B2...that's all...

but yeah the engine thats in it is a dx for sure so can someone explain why i have to go out and buy new axles and hubs just to put in an Si tranny??? is this what everyone, who ever put in an Si tranny, had to do??? anyone??

 

Do you have a 4spd or a 5spd trans?

 

i have a dx 5 spd trans...how can you tell what model of trans is it?? serial #...any code...???

 

i'm rebuilding a d16a6 for my 91 dx hb but i still gotta go find an Si tranny for it. i know there are posts just like these but will someone explain why the dx axles won't work if you put in an Si tranny?? if the DX axles will work in a ZC tranny, why not the Si tranny?? I or we, really need a straight answer from someone who installed an Si tranny into their dx without having to change the existing axles...
i heard you have to change the hubs too??? it doesn't make sense whats the difference between the Si hubs/axles and the DX hubs/axles????

 

ok ive done this.. we put my old si tranny on a dx motor using the dx axles and the only real problem we ran in to is the one hub had to be swaped from the dx if i remember correctly it was the passanger side we also used the si clutch and lighend and resurfaced stock flywheel.. and remember to get new seals from HONDA for the SI tanny other wise it will leak also plan on getting some new gear oil because it will probably leak out.. if so let it all drain out and look in the manual for the spects on how much to fill it .. i cant remember off the top of my head but it wasnt much.. so lets recap:

things to keep in mind:

1: swap the passanger side hubs
2: buy new seals
3: plan on getting gear oil 10w-somthing another
4: maybe new boots and straps

hope this helps !! also if you find that the tanny and motor wont fit togeather .. turn the crank pully till it does!!
shawnD

 

if you don't have si hubs you will have to use your dx axles. the only differance is the outbord splines are smaller on the dx than the si. just got done putting sohc zc and si trans in my dx and i am using the dx axles and it works great.

 

what and where is the outboard spline?? so what had to be done if the DX axles have smaller outboard splines??

so i will have to change the passenger side DX hub to an Si hub???

 

the in board spline is the part that goes into the tranny. the outboard goes into the hub( the part of your car the wheel bolts to ). if you don't have si hubs (26 spline on the out board) then just use your dx axles (i think 23 spline)

 

dx is 26 also the std have 23 either one u have right now will go into the tranny teh std axles are acutally thicker than teh si and dx axles if u put em side by side teh std look like they should be the si ones

 

yes

 

alright...so everyone knows FOR SURE my existing axles will go in the Si tranny ??

how will i be able to tell what year and model of trans i'm getting?? serial # any codes??

everyone agrees that the DX axles will go right in the Si tranny??

so why are some people saying that you need Si hubs/axles to install the Si trans??

 

alright...so everyone knows FOR SURE my existing axles will go in the Si tranny ??

how will i be able to tell what year and model of trans i'm getting?? serial # any codes??

everyone agrees that the DX axles will go right in the Si tranny??

so why are some people saying that you need Si hubs/axles to install the Si trans??

 

you only need the si hubs if you are going to use si axles

 

alright man. what year crx and tranny are u getting? i was told by a performance shop that you had to keep the two groups for everything to work....88-89 and 90-91. but whatever, they could be wrong. I have done this crap. i currently have a 88 dx crx and i put the 89 Si tranny, clutch and flywheel on my dx. the thing my boy said about the " hubs changing"...if you look at the dx and si axels side by side they are all identical on the inside, same number of teeth or "splines" same size length blah blah. Well the passenger side where your axel goes into the tranny. That cup on the Si is shaped different because on the pass. side Si axel the 3 bearings are smaller. This is why you have to change the one cup and put in the dx cup on the passenger side. then your dx axels will fit right in and work perfect. but make sure u keep the Si seals in the tranny. and also it will take 3.8 pints or roughly 2 qaurts of 80w-90 GEAR OIL. and that is if you drain it and change it. there will be a drain plug on the side ( at bottom) has a square opening inside where a 3/8 rachet head will fit in it as if it were a socket. and about 3 inches above it there shoudl be a fill plug on the side, 17 mm. drain it completely and then put 2 quarts in that fill plug. you should be good. sorry it is so long but that is about as easy as i can explain it all and what i went through. look into using your dx 5th gear instead of the Si also cuz it is a bitch losing a bunch of rpms.. 81mph at 4k instead of 96 mph at 4k. hope i helped, and i have done this with the 88 and 89 years.

 

hey thanks bro! and thanks to everyone else who posted their answers!!

the Si motor is from a 90 crx Si and my car is a 91 (if needed to know)

but what cup thing are you talking about?? is the cup thing WITH the Si trans??

the other guy said i would only need to use the Si axles if i decided to use the Si hubs. i'm going to choose to stick with the existing hubs since both outer cv boots are brand new. this makes more sense to me though

but can you explain what cup thing you're talking about?? thanks!

 

sorry that was supposed to be - i'm sticking with the DX axles

and i'm trying to find a 90-91 Si trans for cheap around here

shipping is a bitch! and never trust USPS...some guy sent me a complete intake manifold for 50 shipped and never received it to this day.

 

ok, try this again, i just clicked post and my comp crashed. so i lost what i wrote... the cupsor hub are the round part where your axels go in on the tranny. you have inner and outer cv boots. the outer is where the axel goes in the wheel housing. on the dx both hubs are the same, on the Si the passenger side is smalled because the si bearings are smaller. this is why i say u have to switch the cup because the dx axel will not fit in the Si cup on the pass, side. easy to do, take about 5 minutes with a pry bar , block of wood, and a hammer.... i don't know if it all applies with the 90 and 91 but i do know thats how it is on the 88 and 89. hope this helps...

 

DON'T USE 80-90W GEAR OIL!!!! Hondas use 10w30 oil, and better yet to use Honda MTF. Unless you don't want your transmission to last.

 

umm...thats funny seeings how i have had performance shops that specialize in honda swap and crap, auto supply stores, and even the honda manual say to use gear oil, and the shops and auto stores told me 80w-90 gear oil...i think i will trust them and all f there customers i know that haven't had problems at all over u... " zcivicz" trust who you want, doesn't matter to me. but i do agree that if you go to honda and get the mtf it will be your best bet...

 

Here's what my Helms says





[Modified by fixhondas, 3:45 PM 4/14/2002]

 

i couldn't get thie picture, but like i said, i just went by what the shop and the stupid cheap waste of money haynes manual said. no offence. why is it bad to use 80w-90 gear oil? this is what i put in my 89 Si tranny after putting it on the 88 dx. i lost some fluid changing the cup on the one side to fit the dx axel, and so i changed the oil in it....i wanna know why it is bad for, i have been running on it for acouple months now and no problems????

 

Well, a few months ago, a couple brought there 89 civic dx 5 speed in to the shop. It had been to Pep Boys for a clutch replacement. They put 90w gear oil in the transmission and a week later the differential was shot. Keep in mind that this was winter time. The spur gears were stripped. 90w oil is thick like snot, I don't know if it can't get to where it needs to be in the bearings or what not, but it is too thick. It is also a waste of power.

 

alright, you said to use what kind of oil? what what and type... i know it can't be motor oil that is used.....but i could barelly make out the words on that picture. my comp. displayed it this time....i have 80w-90 in it now, and i surely cannot afford a new tranny, or have it rebuilt. thanks for probably catching a problem before it starts......