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Later model J30's were 3x2 bolt pattern instead of 5x1 where the output half shafts bolt to the inner CV. That change was coincident with the change from rzeppa to tripod CV's. If you made a point of getting everything as 5x1 bolt pattern, then you definitely had rzeppa.
I'm running R34 GTT output shafts on my S15 helical (instead of the S15 output shafts which were 3x2) to get the 5x1 pattern so I can run J30 axles. The R34 GTT came with the same helical LSD as the S15. Not any beefier than the S15 ones, just different bolt pattern. The S15 output shafts are slightly larger than the standard 240sx ones (S13/S14), however the equation for maximum shear stress has a diameter^-3 term in it, that slight size increase does make a difference. So even though you're only changing the diameter by 1mm, the change from 29mm to 30mm of diameter means that the half shaft will hold ~11% more torque with the same level of shear stress.
tau_max = 16*T/(pi*D^3); T is applied torque and D is diameter
What 6x1 bolt style output shaft did you find that works on a S15 helical?
The Q45 output shafts are 31-spline I think which is the same as the Skyline GTR ones and are 32mm in diameter IIRC, which is the beefiest setup you can fit in an R200 diff housing. I can't find the picture I remember seeing online somewhere, but the Z32TT output shafts aren't any beefier than the early Q45 ones, but obviously the ring gear size increase and size of the pinion bearings make the R230 setup worthwhile.
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