I'm wondering what the difference between the GSR and B18b/B16 LSD's are? I'm going to be running a LS case, with GSR 1-4 & FD, LS 5th, what components dictate which diff I need?

GSR LSD:LSD10678
LS/B16 LSD:LSD9000

There's about a $65 difference between the 2 units, am I able to use the LS spec determining part when I do my rebuild? Thanks.

 

LS and B16 carry a 4.266 final drive
GSR is 4.4 final drive

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by badboyr66 &raquo;</TD></TR><TR><TD CLASS="quote">LS and B16 carry a 4.266 final drive
GSR is 4.4 final drive </TD></TR></TABLE>

So is that the only difference? The gear on the LSD is different? So they should be fully interchangeable, but the final drive would change? Thanks for the response.

 

Just looking to confirm that the only difference between the 2 was the final drive gear, and that there are no different sized bearings, or something else that I might be overlooking on this. The seller did not know the difference either, and my searches have turned up nothing, thanks.

 

I am not sure what you mean... with an OBX LSD I am not sure. Obviously the part numbers only go so far. But according to their LSD and part number they interchange.


Anyone else have more light on this?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by badboyr66 &raquo;</TD></TR><TR><TD CLASS="quote">I am not sure what you mean... with an OBX LSD I am not sure. Obviously the part numbers only go so far. But according to their LSD and part number they interchange.


Anyone else have more light on this?</TD></TR></TABLE>

That's what I need to know, is it JUST the final drive gear on the LSD that is different, or is my hybrid tranny only going to work with one or the other. At this point I'm assuming they are interchangeable, but I'd love someone to confirm it before I spend the $$ and find out otherwise.

 

agreed..... I am not sure. But I can say that the diff bearings are different from the two ... kinda wanting to know for sure as well

 

GS-R Diffs are larger. If your using a GS-R diff now get a GS-R and if your using a LS/B16 get that one. You can use a GS-R diff in a LS/B16 case but you will have more work then its worth, alot of grinding then have to use LS/B16 bearings. The diffs don't come with the ring gear so you use the one you have with the matching countershaft


Modified by zCivic at 7:56 PM 2/20/2008

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zCivic &raquo;</TD></TR><TR><TD CLASS="quote">GS-R Diffs are larger. If your using a GS-R diff now get a GS-R and if your using a LS/B16 get that one. You can use a GS-R diff in a LS/B16 case but you will have more work then its worth, alot of grinding then have to use LS/B16 bearings. The diffs don't come with the ring gear so you use the one you have with the matching mainshaft
</TD></TR></TABLE>

So use the diff for the case, not for the gears? Thanks for the reply!

 

yes and no. Prev post I said main but it was countershaft,long day. its 6 of one and half dozen of another. Case matters but also counter shaft/ring gear set. Which one are you using??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zCivic &raquo;</TD></TR><TR><TD CLASS="quote">yes and no. Prev post I said main but it was countershaft,long day. its 6 of one and half dozen of another. Case matters but also counter shaft/ring gear set. Which one are you using??</TD></TR></TABLE>

Not sure yet, I'll have a full LS tranny, and a GSR gearset/shafts to work with. Sounds like I may be better off using as much LS-spec stuff as I can in this build, and just use the gears from the GSR. I guess I'll wait and see what the GSR stuff looks like before I order the LSD.

 

For a drop in use the LS but it prob will have a longer final drive. You said your just using GS-R gears so the main, counter, and ring gear I will assume your still using your LS ones. If you have access to everything GS-R except the case check into getting a GS-R case and get the GS-R diff

 

I'm not overly concerned about the longer final drive, it will just be nice to have closely spaced 1-4 compared to the LS ones. I'll be putting everything into the LS case, so if the LS LSD is easier, then it just makes my decision for me.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by badboyr66 &raquo;</TD></TR><TR><TD CLASS="quote">LS and B16 carry a 4.266 final drive
GSR is 4.4 final drive </TD></TR></TABLE>

The only final drive that is 4.26 is the ls the rest are 4.40 except the 98+ jdm itr which is 4.785

 

I thought the 99 SI was a 4.266

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96Spec Ek &raquo;</TD></TR><TR><TD CLASS="quote">

The only final drive that is 4.26 is the ls the rest are 4.40 except the 98+ jdm itr which is 4.785 </TD></TR></TABLE>

So that would re-raise the question "Why is there a separate application for the GSR, if the LS & B16's use the same OBX LSD"? Do you have an answer for that one?

 

hmmm funky Anyone else?

 

Your thinking the LSD and the final drives are the same which there not. The GS-R/ITR diff is physically larger then the B16/LS. The B16/LS share the same part # because they are the same part the GS-R/ITR have a different # because they are larger. The ring gear which attatches to the diff is what gives you the final drive numbers.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zCivic &raquo;</TD></TR><TR><TD CLASS="quote">Your thinking the LSD and the final drives are the same which there not. The GS-R/ITR diff is physically larger then the B16/LS. The B16/LS share the same part # because they are the same part the GS-R/ITR have a different # because they are larger. The ring gear which attatches to the diff is what gives you the final drive numbers. </TD></TR></TABLE>

That's what I was looking for! Thanks for chiming in!

SO, I order the LSD for the tranny case I'm using, and I can put the final drive from whichever gear set on the LSD, or will the final drive be a different size as well since the diff's are...different?

 

I'm pretty sure the ring gears are the same except for 1 odd JDM cable one. Currently have 2 trans torn down right now at a friends but will be a few days b4 i can get up there to verify they are the same but from what I can remember there the same.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zCivic &raquo;</TD></TR><TR><TD CLASS="quote">I'm pretty sure the ring gears are the same except for 1 odd JDM cable one. Currently have 2 trans torn down right now at a friends but will be a few days b4 i can get up there to verify they are the same but from what I can remember there the same. </TD></TR></TABLE>

Much appreciated!

 

I found my answer on another forum, but I thought I would post back here incase it helps someone else out.

"GSR/ITR (USDM) countershaft goes with GSR/ITR (USDM) ring gear/dif.

LS countershaft goes with LS ring gear/dif.

You can put GSR/ITR dif into an LS tranny, you just need to swap all the gear from the LS countershaft to the GSR/ITR one."

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IanB &raquo;</TD></TR><TR><TD CLASS="quote">

So that would re-raise the question "Why is there a separate application for the GSR, if the LS & B16's use the same OBX LSD"? Do you have an answer for that one? </TD></TR></TABLE>
the LS and B16 use the same diff because of the bolt pattern on the ring gear. it has nothing to do with the FD ratio. GSR, ITR, CTR use a different bolt pattern on the ring gear.
that is why there is a seperate application

 

I can't verify about the B16B CTR Final drive but the pic I seen claiming was a B16B had a sealed bearing like B16/LS which is the case would have me to believe the same as LS/B16 but I have been wrong b4.

I checked the diff against each other. The GS-R is larger just by eyeballing it. So I figured I would measure the ring gear inside which is not much but its about 5mm larger on the GS-R, so I though maybe you could use a GS-R on a LS/B16 diff so measured bolt centers and there different also (lost measurements so not getting exact)

Your back to the problem of which LSD to get. If your wanting to stay 4.4 either get a case for a GS-R with a GS-R diff or get a countershaft and ring gear from a B16 and us the B16/LS diff with your current case. Staying 4.4 is going to possibly cost you some money while 4.2 you already have the parts for. In either case you can get aftermarket ones to suit your needs.

I really hope that your speaking of hydro transmissions because if this is about cable we all have wasted some time because there all the same diffs

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zCivic &raquo;</TD></TR><TR><TD CLASS="quote">Your back to the problem of which LSD to get. If your wanting to stay 4.4 either get a case for a GS-R with a GS-R diff or get a countershaft and ring gear from a B16 and us the B16/LS diff with your current case. Staying 4.4 is going to possibly cost you some money while 4.2 you already have the parts for. In either case you can get aftermarket ones to suit your needs.

I really hope that your speaking of hydro transmissions because if this is about cable we all have wasted some time because there all the same diffs

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

I am speaking of hydro tranny's, lol.

I'm going to rebuild with the LS case, as it's what I have, and the budget does not allow for getting a GSR case. Is there a reason I can't put the GSR diff, ring gear, and countershaft in the LS case?