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R33 Diff Ratios For R32

Josh_TypeX
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bubba Grand Master

bubba

Posted
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So much easier to use the housing the gears were meant for, otherwise you're up for the added cost of new pinion bearings/seals etc as you must use the pinion gear that matches the crownwheel.

When I changed to 3.9:1 ratios I put my 2-way centre into the S13 housing that came with the 3.9:1 gears.

Josh_TypeX Proficient

Josh_TypeX

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I have a whole r32 diff and a whole r33 diff. Is it possible to put the r33 centre and pinion bearing into the r32 housing? Not sure if the pinion can be moved across...

Or else I will have to do what bubba said and install the r33 housing with r32 rear. If I take this route, what do I do about the different sized front mounting holes? Get some solid diff mounts? If so, I assume I will need longer mounting bolts?

Thanks.

tm_r33 Experienced

tm_r33

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Lol this sort of question comes up every week. The manual 33 gtst diff will have a ratio of 4.1:1 just incase u didnt know.

to change to this ratio you cant just put the 33 center in the 32 housing. The 33 crown wheel on the 33 center is matched to the pinion gear in the front of the housing.

pulling pinion out is a pain and if you dont have a press and cant afford bearings and seals I wouldnt bother. Im sick of playing with f**king skyline diffs and I know what im doing.

If the cover plate from the 32 diff fits on the 33 housing u could go that way.

at the front you could posibly find some bushes to fit the big holes in the front ears on the 33 diff. I dont think u will be able to use 33 bolts at the front because they are 2 mm bigger than 32 from memory.

All make sense?

tm_r33 Experienced

tm_r33

Posted
Posted

Both models have the same bolt pattern on the half shaft/drive shaft. Now I assume t he spline count is the same also.

If some one can clarify that the half shafts are the same length in both models then you could possibly just swap rear cover plate and use two large washers and rubbers bushes at the front of the diff.

If half shafts are different lengths then they might be able to be swapped for the 32 items.

Josh_TypeX Proficient

Josh_TypeX

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  • Author
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Yeah I know the r33 gtst ratio is 4.11:1. I have a rb25 so that ratio will be better suited. Thanks for clarifying what is involved in changing the pinion. Looks like I will get solid bushes for the front mounts and longer bolts if needed.

One other question I have is regarding the rear cover. The studs on my cover are stuffed. I have another r32 cover, however it appears to be a non hicas one, can this be used (have a hicas lock bar installed)? It looks like the hicas cover has an indentation for the hicas rack to sit in(for extra support?). The non hicas cover fits, however will it cause an issue having the bar not supported by the diff?

bubba Grand Master

bubba

Posted
Posted (edited)

The covers should swap over fine, halfshaft splines should also be the same if the 32 diff was a VLSD. I had to use my 32 halfshafts when I put the shimmed 32 VLSD into the wagon as the wagons' open centre halfshafts were tiny.

As for the non-hicas cover, it's been a while since I've been under there but doesn't the rack/bar bolt to the subframe? it's not supported by the diff cover at all.. probably just longer fins on the hicas equipped cover.. the bar isn't going to move at all in relation to the diff housing so if you can bolt everything OK, all good :thumbsup:

Edited by bubba
tm_r33 Experienced

tm_r33

Posted
Posted

Just had a thought... 33 has 12 mm crown wheel bolts and 32 has 10 mm. so you cant put a crown wheel from one onto the center of the other from memory.

if u want this 33 diff in your car I would just put 32 cover plate on the back of it and have a play around at the front ears to mount it. dont bother building a bastard from two different diffs if you can help it.

bubba Grand Master

bubba

Posted
Posted

Just had a thought... 33 has 12 mm crown wheel bolts and 32 has 10 mm. so you cant put a crown wheel from one onto the center of the other from memory.

if u want this 33 diff in your car I would just put 32 cover plate on the back of it and have a play around at the front ears to mount it. dont bother building a bastard from two different diffs if you can help it.

Pretty sure you can buy adapter kits which are just basically a bunch of sleeves, or make some.

The other option if you want 4.1 ratio is get a 32 GTR diff, will have to upgrade axles and hubs too but then you get the benefit of a 2-way mechanical centre.

bubba Grand Master

bubba

Posted
Posted

Pretty certain you have to change hubs. I got my 2-way back when our dollar was really good against the yen, if I was to do it nowadays, I would opt to go for a GTR setup.. whole subframe most likely but that also means new rear shocks.

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