R32 & R33 Gtst Diffs

[Russman]

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

[bubba]

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]

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.

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

Surely somebody knows?

[BHDave]

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]

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]

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]

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]

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]

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.

[R334door(s2)]

auto r33s have 3.9s if remeber correctly any1 bak me up on that 1??

[Nismoh]

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?

[Russman]

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.

[lokela]

does anyone know if the Diff Case on a R32 is the same as R33? I know they look diffrent but do they bolt up the same?