Taller Ratio Diff For Non Abs R33gts25t Manual .

[discopotato03]

Before I start I did search here and other Nissan boards ie Z32 and Silvia / 200SX ones .

From what I read an S2 R33 GTS25T manual uses a short nose R200 VLSD in 4.11 ratio and with 5 bolt side stub flanges .

Non ABS R33s have the shortest nose because the ABS sensor versions are slightly longer .

I did read here that S2 R34GTt and S15 200SX use the same short nose length and it sounds like they use the same 5 bolt side flanges as my R33 . Does this mean that the S15 diff bolts in maybe with a change of rear cover and would give the 3.69 ratio and the helical/Torsen style LSD ?

If not is there a bolt in 3.9 ratio option for non ABS R33 .

I'm not after opinions on why the ratio change just the interchangeability facts .

Thanks in advance cheers A .

[GTSBoy]

S15 is 3x2 bolts on the stub axles. So no go on that one. The stub axles for the helicals are not interchangable with VLSD stubs because there are length differences.

S15 is available with helical with both 3.69 and 4.11 ratios.

S2 R34 helical diffs are made from unicorn shit. Just try finding one. They're 4.11 ratio anyway, so don't buy you what you are mostly after (that being the taller ratio).

I don't know that the housing lengths are different at all when the ABS speed sensor is in place on the snout. So I cannot confirm your thoughts around that. Also keep in mind that only some of the models have the shitty 3 channel ABS. Many ABS Skylines have code wheels and sensors on each stub.

[discopotato03]

From pics I've seen the ABS sensor is in the nose of the casing which is a tad longer on ABS equipt R33s (RWD) . I think RWD R34s have the ABS sensors on the sides for 4 channel or four sensor systems . And the shorter short nose case like non ABS RWD R33s . R33s must have had 3 channel if fitted .

I suppose the way out with the side stubs if Silvias didn't have 5 bolt is to fit a Skyline carrier in the Silvia diff case keeping its original crown wheel .

I've been inside older long nose R200s and H190s swapping hemispheres and the only dramas were offsets between different crown wheels . Oh and also crown wheel bolt sizes .

Does anyone happen to know if the carrier offset is the same with Skyline 4.11 and Silvias 3.9 and 3.7 ?

[discopotato03]

From searching around I think the go may be to buy an aftermarket LSD carrier ie Nismo or Kaaz that comes with the correct 5 bolt side stub/flanges . These are supposed to work better than the OE Viscous center not that its a big issue ATM .

So the next question is will an LSD carrier for a GTS25T fit and work in an S14 or 15 non ABS diff assembly with taller ratios ie 3.9 and or 3.7 . I remember reading that R34GTt and S15s had larger stub diameters like GTRs have .

Basically will say an S14 (SR20DET) 3.9 non ABS diff take a Skyline carrier and bolt in with the Skylines rear cover plate ? Are the input flanges same R33 RWD/S14/S15 ?

Thanks , A .

[GTSBoy]

I do not know offhand whether the helical (S15 and some R34) stubs are different diameter/spline count like the GTRs are. All I know is that the length is wrong. But it really doesn't matter anyway, because if you were going down the path of getting a helical, you'd just use all the helical stuff, and if you're starting with a diff that was viscous or non-LSD, then it's not an issue.

But regardless, if you were going to be buying an aftermarket centre, then you can do whatever the hell you like. Build a Frankendiff out of as many differnet bits as you need. Want an R32 housing? Use that. Want the tall gears off a Silvia? Go right ahead. Slap them all together with the aftermarket centre and drift off into the sunset. For example, I built such a diff using mY R32 housing, an S15 centre and stub axles* and the 4.11 gears from an R34 VLSD. Cost more than the result is worth really, but that's only a small issue.

*this resulted in me changing to S14 driveshafts as a consequence, which is not ideal but it works.

[discopotato03]

The idea is to have a bolt in 3.9 ratio diff with the right side flanges to suit my drive shafts , and tailshaft . From KAAZ part numbers you can see which S14s and R33s use the same carrier or hemisphere if you like .

As for carrier offset , some on Silvia boards describe this as the "thickness" difference between crown wheels of different ratios . The change over seems to be between 3.9 and 3.7 and someone reckoned the RWD Skyline 4.11 and S14 3.9 are the same - handy . Also all short nose R200s apparently use 12mm crown wheel bolts .

So with an exchange of carriers and back plate it could be an easy way to get a slightly taller final drive using all factory parts .

I researched GTR R200s a few years back and from memory they used larger diameter R230 side stubs and it sounds like S15 manual turbo and R34GTt are similar/same .

A .

[GTSBoy]

I researched GTR R200s a few years back and from memory they used larger diameter R230 side stubs and it sounds like S15 manual turbo and R34GTt are similar/same .

A .

Yes, we all know that the GTR splines are larger. No, I don't think the helicals are larger too - just different lengths. And NO, definitely NO, any other S15 or R34 diff is not larger in the splines either. There is precious little difference between an R34 VLSD and an R33 VLSD, for example. ABS sensors etc notwithstanding.

F

[discopotato03]

It seems Nissan have changed the R200 carrier or crown wheel offset if you like in the 3.69 - 3.91 gap . The 3.54 and the 3.69 ratio pinions have 13 teeth where the shorter ones ie 3.91 and 4.08 have less teeth and so a smaller diameter .

This is why people find a 5mm difference in crown wheel height or "thickness" when they pull late R200s apart and try to swap their aftermarket LSD carriers from say an S14/S15 3.69 ratio into a shorter 4.08 ratio JDM R200 .

A .