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R33 Gtr Rear Diff Into An R34 Gtr Non Vspec

Godzilladat
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Godzilladat Contributor

Godzilladat

Posted
Posted (edited)

Hi Lads,

Im after some advice. A mate of mine has an r34 GTR with 4.11 front diff gears. after some research it appears an r33 GTR diff looks very similar to and r34 housing/drive shaft flanges/ABS etc and are 4.11.

Is it possible to grab an r33 GTR rear diff assembly and bolt it in to the 34?

Edited by Godzilladat
Ecozile Contributor

Ecozile

Posted
Posted

R33 has different rear diff ratio to a 34. Because one has a 5 speed gb and the other a 6

A mate of mine has an r34 GTR with 4.11 front diff gears.

Kafish? :)

I am assuming his mates 34R is not running and they have a 4:1 diff in the front and they are wondering if they can fit a 4:1 diff from a 33 to their 34. If the car is runing with different front and rear diff ratio, we would have seen an epic fail video :)

I know the diffs are interchangeable because I am about to do this conversion. If all goes well, I should get it done this weekend.

The gearbox it self has got nothing to do with the diff. From what people say, the first gear in Getrag will be useless after a 4:1 convo.

Hey Bob - how is it going?

  • 2 weeks later...
Godzilladat Contributor

Godzilladat

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Posted

R34 already has 4.1 front - just looking for a rear to match it.

This bloke :yes:

Its all done and was pretty much a bolt in deal. Just swapped over the rear cover to the original r34 one. As this 34 is not a Vspec we didnt have to deal with active LSD's.

to those concerned about short ratios with the 6 spd dont be. Around town the thing is spot on. Sure it might struggle down the main straight at EC but everywhere else its great.

Ecozile Contributor

Ecozile

Posted
Posted

For future referenc, a R32 diff can also be used if you are ready to stuff around.

- the R32 ABS rings are differnt. 46 teeth on both 32 & 34 but the gaps are wider on 34. So the rings have to be swapped.

-R32 short axles do not fit 34 centre - different spline pattern. Swap the axles around. Don't know if aftermarket centers resolve this issue.

Gearing not as bad first thought.

Speedo is understandably read incorrect values for speed.

Godzilladat Contributor

Godzilladat

Posted
  • Author
Posted

Speedo is out as you say, understandably. I actually think the 1st gear is a little long with the original 3.54.

The r33 diff housing did have some additional mount points on the casting that we thought might be a problem but upon stuffing it in it didnt touch anywhere and had a minimum of 10mm clearance to the body.

will update once more kms are put on by the owner.

PS. the job itself is piss easy for a weekend warrior mechanical type.

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