I keep getting emails and IMs about trannys so let me set the record straight and offer the easiest tranny fix ever. Please note that All cable tranny gears are interchangeble as long as you use the correct selectors and hubs. but remember if you change the main shaft gear to also change the counter shaft gear. and remember that the Y1 is a 4.266 final drive and the others are a 4.400 final.

Here is my combination:
The tranny started out as a Y1 tranny that was used and abused by two other racers before i got it. and i was a lot harder on it than they were. The tranny had a bad 5th gear in it to start. I replaced the gears with a JDM S1 gear set and 4.400 final drive set. But when i got the tranny in i noticed that 3rd gear was grinding. After 4 months or so 3rd gear started slipping back into neutral when engauged. By this time i had already collected several other broken trannys and decided to rebuild mine. After several trys and many hard learned lessons i got it to work. here is the set up that i have been running for the past 5 months with no problems. So yes it does work.
Casing= Y1
1st - 4th gear = JDM S1 ( replaced 3rd/4th selector and hub and hasnt slip since )
5th gear = USDM S1 ( aka LS )
Final drive gear = 4.440

here is the KmPH ( sorry i have a JDM gluster ) at 4000 rpms in all gears.
1st 31km 19mph
2nd 49km 30mph
3rd 69km 43mph
4th 90km 56mph
5th over 125 km( or over 80 mph ) i will get the exact number tomorrow.


Q: Are JDM and USMD syncros are different?

A: NO I have 2 LS trannys, 1 Y1 tranny and 1 JDM S1 tranny. The syncros were to similar for me to tell the difference with the naked eye. Also i couldnt find and differnece in height or length using any of my measuring tools. So i mixed them, slapped them in my tranny and road tested it. After 5 months i have absolutly NO problems. tranny is like new.

Q: What causes the tranny to slip out of gear and pop into neutral?

A: The selector rings have become worn on the side that the gear slips out of.

Q: Are JDM and USDM gear all different?

A: YES and NO. some are the same. mostly 1st gear and second gear. the others will usually have a different tooth count and size.

Q: Can you tell which gear is which by counting the teeth?

A: NO. not always. Most of the time yes. But i have noticed that with 2 tranny gears LS and I think Y1 the tooth count is the same on 5th gear however the size of the gear is different. which means that yes they are different.

Q: Is there a difference between the JDM S1 and J1?

A: Yes. The 5th gear in the J1 is about 3-5 mph longer at 4000rpms than the JDM S1

Here are some pics that i jacked and edited from the service manuals. Sorry i know the print in the pics is kinda small. save the pics and use paintbrush to zoom in if needed. And please Before you try any of this. Get a Helms manuel from the dealership. for a 90-93 integra. i recommend the 90-91. Since the 92-93 has the GSR. And the GSR is a freak.

This is the Counter Shaft


This is the Main Shaft


This is the selector fork


This is the Gear Selector


I will try and post pics of the actually gears and syncros by comparison. But since Santa fucked me on my digi cam this year i will have to buy one or borrow one from a friend. Ill be nicer this year

If you are having trouble with any of this or need some one to rebuild your tranny. please email me. i will be happy to fix it for you. Flat rates are $100 - $150 plus the cost of parts. The rebuild takes anywhere from 2-5 hours. due to clearancing the gears and selectors. I get a 15% discount at the dealership and will charge you my prices and am will to send a reciept for parts if needed.

Finally please do NOT email me with questions only offers. If you have a question IM me here. If needed my AIM screen name is jdmgeek.

Hope to help. remember is all of us are running in top form the competition gets better.

Marc

 

Awesome post ...I will be referencing it if I ever get a chance to rebuild my Y1 w/ LSD.

 

You are the man!!!!

 

answer for grinding gears: push in clutch..

hahaha j/k

good post, and very informative. thanks for the research!

 

if you want ayanami to fix your tranny, please IM him. let's keep the posts for specific questions you might have.

thanks.

 

what parts do the axles slip into. (spline?) on those pictures.

 

the axles slip into the differential which is not shown above.

 

This should help answer this question

 

is having some issues with getting the cover off the trani. took out all like 12 bolts cracked the seal and it just wont come off.. is there a rod i have to take out of the side of the trani so i can take this cover off and inspect my differential.

 

there is a 14mm bolt on the top of the case. i believe d series are the same. it get bolted to the reverse idler gear and you need to remove the top bolt. just us a 3/8th drive and pry the ring inside back. then lift the tranny casing up

 

uhm. there isnt any room to pry that snap ring back. (behind the 3/8 square plug)

that bolt on top is a 19mm and under that is a back metal plate..

 

read this (like i said in my IM to you):
https://honda-tech.com/zerothread?id=231493

 

Very nice post Marc.

 

Actually, not all cable transmission parts are interchangeable. Specifically, Y1/S1/J1 parts are interchangeable with each other and YS1 parts are interchangeable with each other. But Y1/S1/J1 parts are not interchangeable with YS1 parts (or vice versa). It looks like you probably worked on only Y1/S1/J1 transmissions. This is probably why you consider the 1992-1993 GSR to be a 'freak'. But keep in mind that if you examined any other YS1 transmission (1992-1993 JDM B16A or 1992-1993 USDM LS), you would also find them to be 'freaks' (compared to what you are used to).


[Modified by StorminMatt, 2:30 AM 1/9/2003]

 

[QUOTE]Actually, not all cable transmission parts are interchangeable. Specifically, Y1/S1/J1 parts are interchangeable with each other and YS1 parts are interchangeable with each other. But Y1/S1/J1 parts are not interchangeable with YS1 parts (or vice versa). It looks like you probably worked on only Y1/S1/J1 transmissions. This is probably why you consider the 1992-1993 GSR to be a 'freak'. But keep in mind that if you examined any other YS1 transmission (1992-1993 JDM B16A or 1992-1993 USDM LS), you would also find them to be 'freaks' (compared to what you are used to).

your are partly correct. and yes i have worked on a JDM YS1. the top bearing and gear stay as well as the spring washers are different from the YS1 to others. but not different from the USDM and JDM YS1. Also all the gears are interchangable as long as you used the complete set. i.e. main and counter shaft gears for whatever gear. So yes you can bolt in a YS1 gear set into a S1 or J1 case. and even a Y1 case if you change the final drive on the diff. And did you know that you can even use hydro gears in a cable tranny. but thats another story all together. basicly all the gearing is the same. but if you plan to use any other parts to rebuild your YS1. Make sure its out of another YS1. BTW i didnt comment on the YS1s due to the fact that no one has them compared to the others. S/J/Y1. but thanks for bringing that up.

 

i've physically compared a USDM GSR YS1 3rd gear set (main and counter) to a JDM S1 3rd myself and they are definitely NOT interchangeable regardless of what synchro hub/slider combination you use because the Inner Diameter of the MAIN SHAFT gears are different. this is because ALL 92+ B-series trannies use a larger mainshaft than their 89-91 (JDM) and 90-91(USDM) counterparts.

so exactly how can you bolt a YS1 gearset into an S1/J1 case?

 

This is correct about the YS1, but I think Ayanami was meaning syncro replacement not gearing inthis case... Not trying to speak for him, but I noticed the Mistake on the YS1 info as well (mainshaft and countershaft).

 

bump for such a realivant subject.

 

Ayanami, sent you an IM

 

Ok, now i am wondering, i am currently having my JDM 91 S1 rebuilt with new syncros, bearings and seals. My question is what US car can i get these parts from. I assummed that since a 97 ITR has the exact same 1-5 ratios, i just had the tranny guy order part for a 97 ITR, was i wrong and what are the right parts. If anyone has an answer, please email me at yellowhonda88@hotmail.com or msg me on aim at yellowcrxsir. Please set me straight on this one, i hope i ordered the right stuff.

Brett


[Modified by yellowhonda88, 8:29 PM 1/22/2003]

 

Any recommened things, books, ways to learn about fixing transmissions for a beginner?

 

the easiest way would be to get yourself a helms manual ( http://www.helminc.com ), or (especially if you've swapped for another motor) READ the helms manual and then pull your old trans apart.

if you dont have a helms manual specific to your car/trans, etc, then IMHO you shouldnt be messing with your trans.

 

Okay, I'm bumping this post because I think it kicks ***!! lol, j/k

I have a question that relates to my S1 tranny. I'm grinding 3rd gear when I upshift. It only grinds when I'm over 5K RPM's in 2nd, and it doesn't grind when I downshift from 4th. It shifts nicely when I go from 2nd-4rd at low RPM's.

I'm know next to nothing about tranny's so I'm hoping for some advice on this problem. For info purposes, my shift linkage was recently re-installed because it came loose last week. I had to get the car towed to some shady auto mechanic because I was an hour away from my home town. I'm not sure, but I don't recall 3rd gear grinding before last week. Could be just my shitty memory. Weed will do that to you...