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S15 Diff Into R33 Rear End

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samps Rookie

samps

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I've got an R33 rear end with 4.11 or 4.3 gears in my AC Cobra replica. I'm running a 6 speed behind a 6.0L V8 and need to fit the lower ratio 3.692 from the S15 into this cradle. Does anyone know for sure whether or not I need half shafts and CVs from the S15 or just the diff centre? I understand the R33 diff backing plate may need to be swapped over to the S15 diff.

Can anyone recommend a Jap wrecker in Melbourne metro? Also what's the going rate for a used S15 diff? Otherwise a good performance shop that may sell KAAZ/Nismo diff centre new?

Thanks in advance!

Edited by samps
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samps Rookie

samps

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Swap the crown wheel & pinion from the S15 diff to your R33 diff.

Thanks. Have you done this conversion? I spoke to a diff place and they said going from viscous to helical will probably mean I have to change the LSD centre as well.

Anyone know if I just get a complete S15 diff with half shafts, will it bolt straight into the R33 cradle once I've swapped the back covers?

Edited by samps
blind_elk Grand Master

blind_elk

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I've fitted a Stagea gearset into my R32 GTS4 diff. Swapping the gearset, you keep the centre - they are both "R200" diffs. Then the output shafts fit (they "plug into" the centre), and the halfshafts work. And the whole assembly fits into the cradle. No swapping external components (back plates), no worrying about half shafts.

Bit of a worry about the "diff place" - swapping viscous to helical is swapping the centre, AFAIK.

Talk to Steve at Speed Technology.

samps Rookie

samps

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Bit of a worry about the "diff place" - swapping viscous to helical is swapping the centre, AFAIK.

Talk to Steve at Speed Technology.

Yes but you only said pinion and crown wheel, which leaves the centre out of it.

Not to worry, I've sourced an S15 diff complete with half/drive shafts from Sydney and it's a straight swap.

Cheers

  • 5 months later...
samps Rookie

samps

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OK, I sourced a complete S15 manual diff centre from On Boost Auto (good price, good service) and it's in. Except they forgot to send half the bolts for the inner/outer half shafts. So I'm six bolts short and I've called them back but they don't have any more in the yard at the moment. It's been a few months since it arrived and me actually cleaning and fitting it.

I've tried a few bolt places but can't find a match or anything suitable to replace them in high tensile.

I thought I'd post here in case anyone has a spare set, perhaps from a broken diff or leftover from a conversion? We're talking about the 3 sets of 2 bolts/nuts/washers on each side of the diff that holds the inner/outer shafters together. Total of 6 required, S15 centre.

Any other suggestions welcome!

Paul

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