A co-worker of mine has a JDM S1/J1 tranny in his 1990 hatch with a B17A swap in it.

He just got a Y1 tranny with the really nice helical LSD, (some came with shittier cluth-type) but he wants to keep his tighter gearing of his J1/S1 tranny.

We've figured that he can just break open both tranny cases and swap the ring gear, counter shaft, and LSD from the Y1 into his S1/J1 tranny so he can have the tighter gearing and 4.400 FD of the S1/J1 and the good LSD from the Y1 all in one tranny.

Here are my questions:

Does anyone have a link to a CORRECT tranny comparison page in terms of gearing and final drives of the J1/S1, Y1, and the USDM LS S1/YS1?

Also has anyone ever swapped out the counter shaft and ring gear from an S1 (4.400 FD) into a Y1 (4.26FD)?

Does anyone know for sure if the ring gear from the J1/S1 will bolt onto the differential from the Y1?

I'm thinking that they should be interchangable, but who really knows...

I know the general rule is that the J1/S1 has the same 4.400FD and 1-4 gearing as the USDM Type R and hydro B16A trannies with a shorter-than-.848 5th gear. What i'm intersted in is the actual gearing differences between the Y1 and the S1/J1 trannies. I know the Y1 has farther spaced gearing and a taller 4.26FD, but I want to compare them side by side.

Ideally here is what we are hoping to end up with:

S1/J1 case
S1/J1 1-4 gears
S1/J1 4.400FD gear - ring gear and countershaft
Y1 helical LSD
Y1 taller 5th gear

Thoughts? Help? Links?

 

Well you used to be able to find it in the FF-Squad site, but the site is down and so is all the good information they have on it.

The LSD in theary should fit right in, but i dont really know yet. My friends localy is about to try the same thing, but has not got he chance to yet. As for the swapping the 5th gears thats not a problem those swap right on over.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bryant &raquo;</TD></TR><TR><TD CLASS="quote">Well you used to be able to find it in the FF-Squad site, but the site is down and so is all the good information they have on it.

The LSD in theary should fit right in, but i dont really know yet. My friends localy is about to try the same thing, but has not got he chance to yet. As for the swapping the 5th gears thats not a problem those swap right on over.</TD></TR></TABLE>

Well if nobody else can tell me then I'll be the first here to be able to tell you guys for sure what each gear is, because he is probably going to split both cases today since we're slow at the shop, and from there I'll just count every tooth on every gear and do the math myself.

...but if anyone can tell me beforehand whether or not it will work, that'd be great before he pulls his S1/J1 out and breaks both the Y1 and it apart only to find that it won't work.

Only *potential* problem I can see is the ring gear from the 4.400FD not bolting to the Y1's LSD differential.

 

what about the a1 ls tranny

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civickiller &raquo;</TD></TR><TR><TD CLASS="quote">what about the a1 ls tranny</TD></TR></TABLE>

What about it? What do you mean? Are you referring to the USDM B18A1 S1/YS1 tranny?

Their gears are the fartest apart and have the 4.26FD as well - horrible for all-motor and/or stock motor with normal i/h/e mods.

I still want to see the gearing charts though...

 

I can answer your questions, from personal experience.

The Y1 lsd is a bit of an oddball, and the ring gear is NOT swappable. Actually,
its not even a real ring gear. The gear and half of the lsd housing are cast
together. I have a picture of my Y1 lsd at home that i will post later.

The Y1 trannies have the 4.266 final drive, regardless of whether its LSD or not.
The S1/J1s the usdm S1/A1 ls trans all have 4.4 final drives (i belive that they
did not start using 4.266 finals in ls trans until after 91).
The only way to use the Y1 lsd is to also use the matching countershaft. The
countershaft will have the 1st gear cast into it, so using the y1 1st gearset it
neccesary too.

Let me know what other info you need, i have personally had my hands in all
of these trannies, and have parts and busted tranny cases laying all over my
shed


Modified by rioninja at 2:46 PM 6/18/2003

 

Well I already found out what you mean rioninja, because he broke the Y1 apart and found the ring gear to be 100% different from his S1/J1 style one.

I've not seens a 4.44FD yet - are you sure you don't mean 4.400?

Unfortunately he put the case back together before I could count all the teeth on all of the gears.



He decided to take his chances with the Y1 gearing for now because he said the synchros looked brand new according to him.

He said that if he thinks the Y1 is too tall then he will try to make the hybrid Y1 FD/LSD combo tranny by placing his 2-4 gears from the S1/J1 inside of the Y1 housing.

Another noteworthy thing here is that you cannot put the LSD from a Y1into an S1/J1 case unless you grind away the castings in the diff housing area. I took pictures of the Y1 LSD case to show you all what I mean, and I'll post those wheni get home later tonight.

Thanks for the info rioninja.

 

Hey I have a 88-91 Y1 and S1. I swapped the y1 guts into a S1 case because the bolts were all stripped out. if you like hit me up and I will disassemble the S1 and take pictures of the whole thing for ya. Also if you are looking for parts let me know.

 

Not to intrude on your post. What about a YS1 tranny? I got this tranny with my B17A swap. Its sorta grinding now, but can I use any JDM cable tranny with this swap? I found JDM YS1 tranny but no money yet. Hey why didn't your friend get a YS1?

 

If your buddy is looking for a short geared cable B-series tranny with LSD, tell him to get a JDM YS1 cable tranny. Dont get these confused with the U.S. "LS" geared YS1.

I wish Honda would have NOT called various trannies the same name in different countries.

I love my super short geared U.S. B17 YS1 cable tranny. I picked it up used locally.

 

theres all the b series ratios... should help you out.

 

I love how EVERYONE seems to leave the A1 tranny off the charts when comparing cable B-Series trannies...

I love mine, personally. It matches up NICELY to the GSR gearing that my buddy's EG HAtch had. We both shifted at 8000 RPM, and were shifting at VERY close to the same speeds.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SiR Kid &raquo;</TD></TR><TR><TD CLASS="quote">I love how EVERYONE seems to leave the A1 tranny off the charts when comparing cable B-Series trannies...

I love mine, personally. It matches up NICELY to the GSR gearing that my buddy's EG HAtch had. We both shifted at 8000 RPM, and were shifting at VERY close to the same speeds.

</TD></TR></TABLE>

I've never seen or heard of an A1 tranny until just now.

Why is that?

 

hey that hatch sounds kind of familiar. did your friend buy it that way? or swap it himself?

 

B18C5-EH2,

I have a Y1 tranny with LSD as well. How is it possible to tell which type of LSD is installed?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">got a Y1 tranny with the really nice helical LSD, (some came with shittier cluth-type)</TD></TR></TABLE>

 

Usually if you look throughnthe diff hole the hole through the LSD will be as large as the rest of the diff hole, meaning it's the helical/gear type like the Type R, or the hole will be smaller, which from what I'ves een indicates it to be a clutch-type LSD much like a Kaaz unit.

 

Tell him get a YS1 GSR/JDM tranny then slap a LSD.

my YS1 JDM Xsi tranny is grinding 3rd gear at high rpm shifts what can be the problem gear EXperts?

bad shcrono bad gear?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bossman032 &raquo;</TD></TR><TR><TD CLASS="quote">Tell him get a YS1 GSR/JDM tranny then slap a LSD.

my YS1 JDM Xsi tranny is grinding 3rd gear at high rpm shifts what can be the problem gear EXperts?

bad shcrono bad gear?</TD></TR></TABLE>

I think the JDM YS1 tranny can use the hydro tranny gears and syncros if I'm right, but I maybe wrong. I read it before on a post here.