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R32 & R33 Gtst Diffs

Russman
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Russman Grand Master

Russman

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Posted

Hi everyone.

I remember hearing that R32 and R33 GTSt diffs are the same except for the back plate to allow for a different hicas rack.

Is this correct?

Reason is that there aren't many 2nd hand diffs for an R32 and I have a backing plate from an R32.

I'm after a stocky to put a 1.5 way centre into it.

thanks,

Russ

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bubba Grand Master

bubba

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I've been chasing the same for the same reason.. also to go to 4.1 ratios. I have been informed that the crown wheel bolt pattern is different, if you find out otherwise, let me know :)

It you haven't bought the diff yet, I think you could just buy an 1.5way suited to a 33 maybe.

Russman Grand Master

Russman

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  • Author
Posted
I've been chasing the same for the same reason.. also to go to 4.1 ratios. I have been informed that the crown wheel bolt pattern is different, if you find out otherwise, let me know :P

It you haven't bought the diff yet, I think you could just buy an 1.5way suited to a 33 maybe.

Nah I want to start with a new diff I know all about unless if one comes up cheap enough.

Surely somebody knows?

BHDave Grand Master

BHDave

Posted
Posted

the backing plate is different.

The front mounts are different. you need to machine up a bush and press it in.

The crown wheel bolt pattern is the same. This one is actually a bit of a myth as there are actually different bolt diameters in the r200 centers but i'm pretty certain that the r32 and 33 ones are the same size as r32 actually has the larger size bolts. Doesn't matter really as there are converter bolts available from nismo that have a larger shank to suit the larger hole in the center and a smaller thread to suit a smaller crown wheel bolt size as used in s13 ratios (3.9's). pretty certain i have some floating around somewhere....

Russman Grand Master

Russman

Posted
  • Author
Posted
the backing plate is different.

The front mounts are different. you need to machine up a bush and press it in.

The crown wheel bolt pattern is the same. This one is actually a bit of a myth as there are actually different bolt diameters in the r200 centers but i'm pretty certain that the r32 and 33 ones are the same size as r32 actually has the larger size bolts. Doesn't matter really as there are converter bolts available from nismo that have a larger shank to suit the larger hole in the center and a smaller thread to suit a smaller crown wheel bolt size as used in s13 ratios (3.9's). pretty certain i have some floating around somewhere....

Thanks mate. Same ratios too?

BHDave Grand Master

BHDave

Posted
Posted

nah, s14 ~3.7 from memory, s13 ~ 3.9, r33gtst ~ 4.1 and r32gtst ~ 4.3.

very roughly. A bit of research can confirm the exact ratios available. there are a few ratios in between and i think the r32gts4 is close to 4.4

bubba Grand Master

bubba

Posted
Posted

Hmm so I should be able to bolt an R33 crownwheel to my R32 Nismo diff? just need to utilise converter bolts with a thicker shank?

I have been given so much conflicting information over this! I want to drop the ratios a bit as 4.3's with the RB30 is a bit too short.

BHDave Grand Master

BHDave

Posted
Posted
Hmm so I should be able to bolt an R33 crownwheel to my R32 Nismo diff? just need to utilise converter bolts with a thicker shank?

Thats worst case. You'd need to confirm the bolt size on the crown wheel once you have the diff open.

bubba Grand Master

bubba

Posted
Posted

Ahh OK, so if I grab myself a 33 diff it should all bolt up I just MAY need some converter bolts?

By the sounds of what I was previously told, it wasn't going to work at all and I needed to stick to S13/R32 diffs.

  • 2 weeks later...
Russman Grand Master

Russman

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so... in theory... i could also buy an r33 diff to bolt up into my 32 for lower cruising revs...

I am sitting on 3100 rmp at 100 clicks...this seem far to high?

Yeah but it's only 5% difference. So 2945 rpm instead of 3100. If you do, sell me your R32 diff.

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