Alright, after buying a '93 GSR transmission only to find out the diff was shot I bought what I thought was an other 2nd gen GSR diff to replace it. Long story short I didn't realize that the speedo ring gear was of different diameter until I took the car for a test drive after a rebuild and install and my speedo didn't work. I'm assuming that the diff is out of a 3rd gen GSR, since the seller assured me it was a gsr diff.

So on to the point of my question, is there a way to use the 3rd gen VSS shaft in conjunction with my 2nd gen VSS body to make it work correctly?
I think this would give me a correct speed reading still, since it wouldn't affect the "gear ratio" between the VSS and speedo ring gear.

 

That's odd about the speedo gear being a different diameter. If you simply swapped diff carriers, you didn't buy a 3rd gen GSR diff -- it wouldn't fit your YS1 ring gear. Also, you would have had to do some case clearancing to get it to fit without interference. I don't know what diff you've got -- try and find out, maybe?

As to the speedo ring gear, I have *heard* that some are incompatible with certain VSS models. For what it's worth, I run an ITR LSD in my YS1 case, and am using the stock 1991 Integra VSS without any problems.

I believe you can swap the VSS shafts (my LSD came with the VSS shaft), but it looked like a pain in the *** so I just decided to try the one that was in there already.

 

I'm looking into putting a itr lsd in as a solution to the problem, I might as well make it worth my while if I gotta tear it all down again.

I've done a little bit of research both here and g2ic, but all the info I can come up with is you have to shave the case a little bit. Can you elaborate a bit more on what is needed to swap in anitr lsd?

 

Here is a thread discussing some general YS1 swap info: https://honda-tech.com/zerothread?id=943822

I can post a photo of the case clearancing if you want to see what you're getting into -- it's very minor. I'll have to dig it up..

 

Thanks for the info, pictures of the clearanceing would be great if you are willing.

Also one quick question, did you say that you can just use the stock ys1 shim for the diff. carrier or was that just my misunderstanding.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Stubbs &raquo;</TD></TR><TR><TD CLASS="quote">Thanks for the info, pictures of the clearanceing would be great if you are willing.</TD></TR></TABLE>

Here it is. You can see where I cut the 'fins' down. I think I went a bit overboard -- you really need to clearance the area down deepest, and not so much the taller fin area. Do some trial fitting and you'll see what I mean.



<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Stubbs &raquo;</TD></TR><TR><TD CLASS="quote">Also one quick question, did you say that you can just use the stock ys1 shim for the diff. carrier or was that just my misunderstanding.</TD></TR></TABLE>

The shims usually account for differences in case machining. The gears and shafts are produced at much closer tolerance, so there's not much variation (this is my theory, anyway). I'd follow the measurement procedures in the Helm manual to be sure, but in my case, the shims that were already there worked fine.

 

Thanks for the picture and the help.

 

One last follow up question, with the ITR LSD can I use my 92-93 GSR ring gear, or do I have to use the ITR ring gear?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Stubbs &raquo;</TD></TR><TR><TD CLASS="quote">One last follow up question, with the ITR LSD can I use my 92-93 GSR ring gear, or do I have to use the ITR ring gear?</TD></TR></TABLE>

You will need the GSR/ITR ring gear. I would also make very sure that it will work with your countershaft.

 

What is the difference between the ring gears?

 

The bolt pattern is different -- the GSR/ITR may also be slightly larger (at least in the center).

 

I replaced the diff. with an ITR unit last night and took some pics of the old diff.

I had one odd problem, the ITR speedo gear was rubbing the case housing. I was pressed for time and did the only solution that made sense, I swapped the shim to the bell houseing side and it made everything align just right.
I hope that moving the shim over to that side won't cause a problem.

Pics of speedo gearless diff:

Comparison of original diff to speedo gearless diff:

 

I don't think moving the shim will cause trouble, as long as everything lines up. Good luck with it. If the speedo still gives you trouble, check the VSS. The cable (if it's a cable VSS -- forgot to ask) can get pulled out just enough so that it no longer connects to the VSS internally, but is still held in place by the clip/grommet. Pull the boot and clip off, shove the cable in, and replace the clip etc.