TheOne

If someone here has done the swap with those halfshafts, then I wouldn't be dropping a ton of money on figuring out if things work or not. It's like how the Z32 brake swap is so popular with S-chassis cars. A few people did it and knew that it worked. Now it's common knowledge and everybody does it without dropping a ton of money to figure out if it works. The power of the internet!

Based on the research I've done, the S15 pumpkin will bolt to the S13 subframe. It's not a common swap, but I did see a few people say they've installed it into an S14. If it fits the S14, it should fit the S13. I just need to hopefully swap the rear cover with the S13 one. I do have to either make or purchase the two bushings for the front of the diff since it is missing those. Shouldn't be a big deal. I do know that the S15 housing is longer due to the speed sensor. As I've said, I'm piecing things from scratch, and need to go with a custom driveshaft anyways to mate the GM T56 transmission with the diff. Shouldn't be an issue.

Looking to buy the 6 bolt stub joints from an R34 GTR differential (NON V-Spec). Let me know if you have them.

I completely understand what you mean, but I'm not sure you understand where I'm at with the diff. I have the COMPLETE S15 differential and output shafts. I could run it as is with the S13 axles for the time being. If I can find out if the R34 GTR stubshafts fit, then I would just need the correct axles and hubs (which I can source fairly easy here in the US). I could sell the S15 stubshafts and recoup a good amount of total cost. This all depends on if I can find the R34 shafts. Someone has to have a set somewhere, or even a junkyard or rebuild shop or something.

Yeah but the Quaife is like $1K easy. I would only get a Quaife for a Q45 or 350Z center, but I want to see what my options are for the S15 center first.

As I mentioned, I want to run the helical diff. The complete R33 rear end would be really expensive. That stuff isn't common in the US. Skylines alone are really uncommon in the US. Again, the R32 stuff is also not common. I want to try something different.

For the hub side splines, in the US there is the TT z32 and q45 hubs we can run. The only question I have is about the splines in the gtr diff

In what way are the splines different for the gtr diff? Where did you get that info from? Are there any parts dealers that can get part numbers at least?

Bump, anybody? Nobody has a spare GTR diff that they can take a look at?

Both, I need to compare all dimensions that would make this feasible or not. I need to know if the engagement length of the R34 splines is the same as the S15.

Sounds like the GTR stubshafts are 30 spline based on this classifieds ad: http://www.skylinesaustralia.com/forums/topic/402740-r34-gtr-stub-axle-half-shaft/ S15 HLSD pic from eBay R34 GTR Stubs Comparing those stubs to the S15, they look very similar, but I'm not sure if the lengths are similar.

Right, I understand what you're saying. This is the exact reason why i made the thread. I want to know if the stub shafts from the R34 GTR can fit the S15 HLSD. If they can fit, and the overall width of the diff doesn't change, then this a great discovery for S-chassis owners for stronger axles while retaining the helical differential.

http://www.skylinesaustralia.com/forums/topic/95568-helical-diff/page-3?hl=%20hlsd "No idea really vspec or not.. The S15's brochure claims it runs the same helical diff as the R34 GTR. "

http://www.skylinesaustralia.com/forums/topic/95568-helical-diff/?hl=+hlsd "The S15 runs the eact same diff center as the R34 GTR. S15 diff being weak; what power level with what tyres are we looking at SteveL? "

I understand that some people may not have had problems with the axles, but I am building the car from scratch. I'd rather put up a little more money to eliminate the fear of breaking something. Did you read the thread I posted above? "Yes, but if you read the rest of my post....you can't have GTR style 6 bolt drive shafts because there aren't any half shafts to match them and the diff centre." It didn't sound like you knew for sure if the R34 GTR non-V-Spec definitely did not come with the HLSD. I found this thread here: http://www.freshalloy.com/showthread.php/147112-Install-Guide-Q45-Differential-swap-into-240SX-subframe/page2 "If you want to upgrade your output flanges you can use the R34 Sklyine output flanges which are 6x1 and will work in the HLSD, ofcourse these gotta come from a HLSD equiped R34. R34 HLSD output shafts Part #'s 38220-0V771 (left) 38220-0V770 (right)" Here is this too: http://www.skylinesaustralia.com/forums/topic/379872-r34-gtr-or-r34-gtr-vspec/ "I own a non V-Spec 34 with 340awkw (no idea what that equates to in hp), and the extreme amount of traction actually makes it a lil boring... Wait till you push it a lil and you will find how grippy these mofo's are. The helical diff in the non V-Spec is actually a huge improvement over the viscous units, they promote better traction and keep the rear a lot straighter whilst wheelspinning. I had mine in rwd mode for a couple of weeks after a dyno run, even with 275's you really begin to appreciate what the 4wd system does I have a later model (01-02), which means that i get the sexy black interior, better coloured brush aluminium console, alloy pedals, and white dials. The 2nd gen R34 GTR is definitely preferable to the 1st (arguably the 1st gen vspec too). You will eventually seek your own stiffer suspension, bigger rear brakes, and diffusers that you miss out on. VSpec II's are still very expensive in Aus. "

http://www.skylinesaustralia.com/forums/topic/151921-s15-helical-lsd-into-non-lsd-stagea/ "Yep used the R34 output shafts with the S15 diff, fitted fine with no problems at all. " "R34 GTR does not have an HLSD. Uses normal type LSD. Even if it did use an HLSD, it would have halfshafts and driveshafts with the same 6 bolt (6, evenly spaced, not 3x2 like S chassis cars) driveshafts as other all the other GTRs." -> Yes, I want the 6 bolt evenly spaced halfshafts, not the 3x2 that my S13 has. I plan on running Q45 axles in the car. The S chassis halfshafts are weaker because instead of using a ball and cage CV joint, it uses a tripod. The ears of the tripod seem to break, in addition to the the spline that goes into the hub. With the Q45 axles, I shouldn't run into that problem.

Hey all, this is my first post here. I'm from the US, and am building an LS3 powered 240SX coupe. For the rear differential, I purchased a complete S15 Spec-R HLSD pumpkin which I will swap in. The output shafts from the S15 differential have the 3x2 bolt pattern, and my only options for axles are the stock ones or really expensive ($1000+) custom ones. I am afraid I will blow the stock ones, so i need to think of a way to strengthen the rear up. I just recently read on a few forums that the R34 GTR uses the same exact HLSD found in the S15, but it has the 6x1 output shafts. Question #1: Does anybody know if the S15 and R34 GTR output shafts have all the same dimensions, all except for the bolt pattern? Can I purchase a set of the R34 GTR HLSD output shafts, and swap them into the S15 pumpkin with no problems? Question #2: Is there another model which uses the same output shafts as the R34 GTR? Maybe the R33 or R32 GTR? Question #3: Has anybody broken the HLSD before? I should be around 400 WHP/ft-lb with sticky 255 summer only tires so I'm not sure how it'll stand up against backroads driving/auto-x/light drag racing/light track use. Question #4: If the R34 GTR output shafts are the ones I need, would anybody here be willing to sell them to me? I would pay for shipping of course. Question #5: Do you know how the width of the R34 GTR rear end (flange face to flange face) compares to the S15 HLSD? Is it the same? I'm hoping I can swap these output shafts onto my S15 diff and have stronger axles.