So far, I think I have found 4,(now5) different types of OEM LSDs that came in B series transaxles. . This is what I have so far; correct me if I am wrong.

The only USDM LSDs came in ITRs.............................................. .....................Helical type---10 bolt ring
Most JDM ITRs .................................................. ..........................................Helical type---10 bolt ring
All CTRs.............................................. .................................................. ......Helical type---10 bolt ring
Some 96/97 JDM ITRs, used for factory rally/off road, and maybe some JDM GSRs....Viscous type---14 bolt ring
JDM GSRs with optional lsd .................................................. ..........................Clutch type---10 bolt ring?
JDM B-16 cable Models............................................ ......................................Viscous type---15 bolt ring
some early models (years?).......................................... .............clutch type?, one piece(NO ring gear bolts)

The final drive gears will not interchange between the 10 bolt, 14 bolt, 15 bolt diffs and obviously no-bolt models. But, between these, there is another difference regarding ring gear diameter, that further complicates interchangability, all B-16, and LS hydro diffs and the YS-1 cable diff, used the small ring gear diameter; All the Hydro GSRs, and Type-Rs used the larger diameter ring gears; they are not interchangable between large and small size. Finally, When changing Diff gear ratios(final Drives), you must change the countershaft with the ring gear; the countershaft has the non removable Diff pinion gear on it and is a matched set with the ring gear. In other words, a 15 tooth pinion gear for a 4.40 ratio final drive is NOT the same as a 15 tooth pinion for a 4.26 ratio final drive. they may fit, but (from personal experience)they will break the first time you put a load it.

finally, there seems to be differences between the USDM and JDM counter shaft 1st gears, which are also machined onto the shafts, requiring a matching MAIN shaft 1st gear, when changing between JDM and USDM final drive gear sets.

I have been through LSD hell concerning shopping for/ buying mis-matched parts, and am still a little foggy on the diffs, I would appreciate any corrections/ additions to what I have posted so far.
This is just for B series boxes and OEM LSDs at this point.

This has nothing to do with my build; I finally got that sorted. Just trying to put up some useable info for others now, and satisfy my curiosity, and maybe get a "sticky" posted.
thanks.

 

JDM ITR/CTR and USDM ITR are the same.

Anything other than CTR/ITR is viscous. All ITR/CTR are helical.

I've never seen a 15 bolt diff.

B16A/B18A/B/B20 use the same bolt pattern and ring gear ID

B16B and B18C use the same bolt pattern and ring gear ID.

 

90-91 Y1 LSD is 15 bolt ring gear, 4.266 ratio.



We've both replied to a thread of his recently.

https://honda-tech.com/forums/transmission-drivetrain-127/question-mista-bone-aquafina-2679433/

 

Ditto. 10-bolt, 14-bolt, and 15-bolts diffs should be the only ones out there. 10-bolts are the helical ones found in all ITR/CTRs, the 14-bolts are in select GSRs and are viscous, and the Y1 has the 15-bolt and is viscous. Never heard of the JDM ITRs with viscous. That's news to me.

My friend actually has a 15-bolt diff, ring gear, and countershaft for sale from a trans we had. I think he just posted it in the FS/WTB thread in here.

 

here is a pic of a 15 bolt ring gear

 

Ok, I guess that just leaves the JDM SiR2s with optional LSD. Same as the 14 bolt GSR LSD?

 

I JUST PULLED THIS LSD OUT OF A JDM GSR TRANS.
14 BOLT VISCOUS

 

I have one of those with a cracked ring gear, any chance you would sell the gears to me?
email: stevealexanders@netzero.net.
Thanks.

 

nah, but might sell the lsd

 

or maybe trade for that type r gear set?

 

bump

 

Hmm this is kinda confusing..

So JDM GSR (optional) LSD can be either:
1) Viscous 14 Bolt
OR
2) Helical 10 Bolt?
OR
3) Clutch 10 Bolt??

I thought Honda OEM only had Viscous or Helical?

 

JDM GSR with OEM LSD is 14 bolt viscous. There are no OEM clutch type LSDs.

 

Great.. that means i can't swap in the ITR 4.7 FD..

From page:
http://www.jhpusa.com/store/pc/viewP...idproduct=3680

"NOTE: This FD kit is a direct drop in for all JDM/US 94-01 Integra GSR & 97-01 transmissions.
All 93-00 Hydro B16A and 94-01 Integra LS transmissions will need a B18C or Type-R differential/LSD in order to be compatible with this FD kit."

Looks like they missed out the part about OEM Viscous
None of the sites that sell the FD kit mentioned this bit of info, or i may have missed it.
:/

 

MFactory's website states FD's won't work with OEM LSD's other than the ITR.

That is why you should support shops the deal with transmissions everyday. That way you get what you need and not what you don't need or can't use.

 

I know its been a long time since this post but by any chance, does you friend still have the ring gear? I need a 15 bolt rig gear that has a 4.4 findal drive. Tring to put a Y1 LSD into a YS1 92-93 GSR trans that has a 4.4 countershaft setup. LMK

 

this is an old thread that I started a long time ago, but I am adding some follow-up info;
I recently tore down a customers JDM b-16 Hydro swap that he got from an importer. I was expecting to see an open diff, but found a 14 bolt viscous. He was wanting to install a 10 bolt FD set, so was out of luck.

Second, I still have not found an explanation for the no-bolt ring gear, LSD diff, that I got out of a B16 hydro tranny several years back. Anybody ever seen one of these.(the ring gear appeared to be part of the diff, with no attaching bolts.??? I wish I had taken pictures of it, before I lost it to a tranny shop, that substituted a 14 bolt diff with cracked ring gear teeth, into my tranny. It never even made it around the block.

Thanks for the corrections to my orriginal post....that clears things up a lot.
1) there are no OEM clutch type LSDs
2) there are no 10 bolt or Helical GSR LSDs(so I guess if you want to change the final drive on a GSR LSD trans, you need to get a 10 bolt diff first. Same with a JDM Sir2 LSD tranny, unless there is an after market 14 bolt FD available? anyone know of one? I have a couple that I would like to get a taller gear for.

 

Hi mates i recently purchase this LSD used for my S21 Tranny and the seller told me that it came from a ITR tranny but when i turn al low speed it locks very hard so i want to know what kind of LSD i get before installing it i disassembly it and it came with 2 disk inside and i think that OEM LSD dint came with disk help me please this a picture of it

 

Some More Info:

- The B16A Y1 LSD's that came on CRX/EF SiR-I has a 15 bolt pattern (i believe) and a 4.266 FD (Final Drive). These are not that valuable bc you cant swap it into a 4.4 FD tranny unless you get a custom 4.4 FD ring gear
- The B16A SiR-II LSD's that came on the EG is same as JDM GSR with a 14 bolt fd ring gear on the LSD. I believe its a 4.4FD. (Both of thses are viscous type lsd's)
- The itr lsd is a helical type lsd with a 4.4 FD (USDM) and a 10 bolt ring gear. This is the best one with interchangeability bc you can put it in a b16, gsr, or ls tranny and all you need is either the stock 4.4 fd ring gear or a 4.266 fd ring gear thats a 10 bolt pattern which they all are on open diffs.

Hope this helps. If you have any more questions, lmk and i can prolly be of assistance

 

Helical Type R LSD will only accept the larger 4.4 FD from a GSR or ITR/CTR or the 98spec 4.78 FD.
The B16 4.4 FD and the LS 4.2 FD will not fit the Type R LSD

 

Ohh, ok. I didnt know that. Thanks for the info. I appreciate it

 

No problem! That is what we are all for...to help each other out!

 

Thanks guys for contributing; now if I could just find someone that makes a taller FD than the 4.40, that fits the 14 bolt viscous diff. The Helical types are just too agressive for our little Minis, esp the Mfactory ones. I had to pull mine out... made the car change two lanes in a blink! Got a CTR LSD in there now, which is better, but still a bit twitchy on the straights....I can almost keep it between the lines

 

hello,
i'm looking for help because i have bought a 14bolt viscous lsd 66teeth i think 4,4, but i have not the primary shaft and i'd like to install it into a y21 b16a2 4,266 trans (my shaft will not work w the 4,4 one right?)

which type of primary shaft will fit my 4,4 final ring? (i suppose not the ek9 and itr ones)

many many thanks for any help!

 

The countershaft (pinion) that you need for that ring gear came on B-16 Sir2 and GSR transmissions with optional 14 bolt Viscous LSD. If you try using any other Countershaft, even if it has the 15 tooth gear, I think it will not mesh properly, causing gears to break or wear, and make noise. I know this, because my first tranny that was assembled by a so-called transmission-shop had this mis-matched combo. it cracked the gears before I even got around the block! You can't get replacement gears for that LSD in the USA, so, like me, you are stuck wiuth a good LSD and no Final drive gears for it. I bought an Mfactory LSD to replace it, had trouble with it, and finally replaced the whole tranny with a CTR unit.