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Discussion Starter · #1 · (Edited)
Hi Guys,
Please have a look at the pictures and tell me if I got this right.
First four pictures are from a GU Y61. The diff centre housing is Identical to my
GQ H233B diff centre housing. Bolt holes are the same. Flange is different.
My concern is the Diff centre.
Mine clearly shows the clutch friction plates.
The one from GU doesn't. From outside, it looks like an open diff to me.
My questions are,

1)Is this GU diff an LSD(Limited slip diff) or is it an open diff?
2)Did any of the GU or GQ diffs come with non LSD, standard open diffs?
3) GU diff is marked 4.3, but it must be 4.375. Am I right?
4)Is this GU diff compatible with my GQ RB30 H233B 4.375 diff(other than the flange, which can be exchanged)?
5)Why are the diff centre bit is completely different?

Thanks in advance for any help, advice.

P.S. Housing, axles, bolt holes all match. I'm bit concerned about the "massive" difference in the centre.
 

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GHMBC #3
nissan patrol gq lwb,3"lift.
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ones a front or its the small hemisphere rear,can't see any clutch plates tho

second look i would say its small hemisphere which is in alot of peoples opinion just as good as the gq one.they were fitted to tb45's
 

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GHMBC #3
nissan patrol gq lwb,3"lift.
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no open diffs on gq or gu rear all lsd except for factory vac locker
ratio is same 4.3/4.375 and is ok with yr front
 

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Discussion Starter · #4 ·
no open diffs on gq or gu rear all lsd except for factory vac locker
ratio is same 4.3/4.375 and is ok with yr front
Hi mate,
Front diff is fine.
It's the rear I've been having trouble with. I got this secondhand one which was told to me is fully compatible with mine except the flange, which is obvious, but a relatively easier swap over(if I don't stuff up the preload setting)
Is this GU diff an LSD by the looks of it?
It can't be a front diff, wrongly marked as the rear one, can it?
The diff centre housing and bolts are pretty much identical with my RB30 4.375 H23B rear diff. I'm yet to confirm it by sliding it in. That will be the first thing tomorrow morning.
It's the totally different looking diff centre bit that gave me a bit of a scare.
gear splines looks the same. I'm just about count the splines and confirm it.
Thanks
 

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Discussion Starter · #5 ·
ones a front or its the small hemisphere rear,can't see any clutch plates tho

second look i would say its small hemisphere which is in alot of peoples opinion just as good as the gq one.they were fitted to tb45's
These small hemisphere ones are LSDs(rear), are they mate?
That's my worry.
I'm concerned this is not an LSD, 'cos I can't see the LSD mechanism( if any in this GU diff centre). AFAIK, they are friction clutch plate based.
It's not obvious on these pictures. I'm uploading the pictures again with labels on them, so it's easier to see the difference.
 

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If it is a rear diff from a GU patrol it is LSD, there are only LSD rears or factory vacuum locker rear. There are no open rear diffs in GU's. There is as stated two different sized LSD hemispheres though, that looks like the small one, it's pretty random which year and model came with the small ones.
 

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Discussion Starter · #7 ·
If it is a rear diff from a GU patrol it is LSD, there are only LSD rears or factory vacuum locker rear. There are no open rear diffs in GU's. There is as stated two different sized LSD hemispheres though, that looks like the small one, it's pretty random which year and model came with the small ones.
Yes, I understand now. By hemisphere, you obviously meant the size of the diff centre housing/case. Larger one is H260, I believe. The ones come with Utes both GQ & GU?!
Can the Factory vaccum locker be removed?!!
Then it becomes an open diff?!!

This GU diff is marked as a rear diff 4.3 as show on the picture. But, I'm not taking it as it is.
I think, I better make sure this is the real Mccoy.
What is the best way to do that?!
Thanks mate.
 

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Discussion Starter · #8 ·
This GU one is an LSD. Just a later model. I've been told this newer GU 4.375 LSD isn't as good as the old 4.375 LSD from my RB30 GQ Patrol.
So, the older ones are better?
Diff centre housing, bolts, ratio are compatible. I'm yet to find out whether the flange swap over is going to be a simple swap over with the correct preload or whether it's going to be a fiddly job.
I'm about to get into that.
I'll post the result shortly.
Thanks guys.
 

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If you're worried about ratios, the numbers are stamped on the outside of the crownwheel. The 4.375 (commonly called 4.3s) will have 35:8 stamped on it from memory.

I came across similar when swapping to 4.6s. I swapped out the small LSD for the larger one that I had in my 4.3 factory diffs.
 

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GHMBC #3
nissan patrol gq lwb,3"lift.
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Yes, I understand now. By hemisphere, you obviously meant the size of the diff centre housing/case. Larger one is H260, I believe. The ones come with Utes both GQ & GU?!
Can the Factory vaccum locker be removed?!!
Then it becomes an open diff?!!

This GU diff is marked as a rear diff 4.3 as show on the picture. But, I'm not taking it as it is.
I think, I better make sure this is the real Mccoy.
What is the best way to do that?!
Thanks mate.
hemisphere is the internal part with clutch pack- big and small in gu h223 diff centres.h260 diff centre is about a 10 1/4 inch ring gear and is fitted in gq utes(mainly leaf sprung) and in gu wagons (some) and gu utes (some)

all mixed up lol

IF THE 1ST 4 PIC'S YOU POSTED are of a gu 4.3 diff it has the smaller hemisphere(lsd/clutch pack) and will be fine in yr gq rb30
 

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Discussion Starter · #11 ·
hemisphere is the internal part with clutch pack- big and small in gu h223 diff centres.h260 diff centre is about a 10 1/4 inch ring gear and is fitted in gq utes(mainly leaf sprung) and in gu wagons (some) and gu utes (some)

all mixed up lol

IF THE 1ST 4 PIC'S YOU POSTED are of a gu 4.3 diff it has the smaller hemisphere(lsd/clutch pack) and will be fine in yr gq rb30
Yeah mate, my understanding gets better as you write more. :D
Diff specialist says the older diff centre with the clutch pack is better.
He reckons the GU one's teeth is better('cos it's newer & less kms), but the LSD centre is inferior. So, he advises me to use the crown wheel & pinion from the GU one, and use the diff centre bit from the old one and make a better LSD diff that way. I haven't decided about that yet. I think I may need a second opinion as well. The older GQ RB30 diff centre wasn't much of an LSD before I started pulling it apart. But, I'm not sure that's caused by the loose pinion nut(shot bearings) or the clutch pack is worn out.
I'm yet to find out. I'll post the outcome soon.
Thanks
 

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Discussion Starter · #12 ·
If you're worried about ratios, the numbers are stamped on the outside of the crownwheel. The 4.375 (commonly called 4.3s) will have 35:8 stamped on it from memory.

I came across similar when swapping to 4.6s. I swapped out the small LSD for the larger one that I had in my 4.3 factory diffs.
No mate. I'm worried about whether this is a GU/GQ front open diff spider gear set swapped with a rear LSD pack. It looks different from my rear GQ LSD centre in the LSD spider gear pack(pardon me, i make up the terms as I go, but you know what I mean).

I've been told by a diff bloke this is an LSD, but I'm still uncertain, to be honest.
 

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GHMBC #3
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my understanding from what i have read about patrol lsd's

small hemisphere-strong unless running big turbo's on a diesel, gu auto tb45's have these and in reality there is little mentioned about these lsd's breaking but have seen broken plates on gq tb42 big hemisphere's.big is not always better/stronger
gq big hemisphere-as strong and generally the tightest/best hemisphere and the most used hemisphere

h260 hemisphere,several things with this one-bigger ring gear,bearings and axles =more load capacity but not as tight of a lsd maybe because it's design is for weight/load requiring a more forgiving lsd and not offroad as much-workhorse

and remember gq rb30's/tb42's are at their oldest 25 yr old and 300k + abuse
my tb42 gq big hemisphere was still good after 300,00k when i removed it and installed a detroit which makes the lsd seem like an open wheel.it bangs like a dunny door in the wind on the road with a load on but offroad it's awesome.full drive to both wheels all the time

i would bang the gu centre in and see how it goes or shim yr original one
 

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Discussion Starter · #14 ·
my understanding from what i have read about patrol lsd's

small hemisphere-strong unless running big turbo's on a diesel, gu auto tb45's have these and in reality there is little mentioned about these lsd's breaking but have seen broken plates on gq tb42 big hemisphere's.big is not always better/stronger
gq big hemisphere-as strong and generally the tightest/best hemisphere and the most used hemisphere

h260 hemisphere,several things with this one-bigger ring gear,bearings and axles =more load capacity but not as tight of a lsd maybe because it's design is for weight/load requiring a more forgiving lsd and not offroad as much-workhorse

and remember gq rb30's/tb42's are at their oldest 25 yr old and 300k + abuse
my tb42 gq big hemisphere was still good after 300,00k when i removed it and installed a detroit which makes the lsd seem like an open wheel.it bangs like a dunny door in the wind on the road with a load on but offroad it's awesome.full drive to both wheels all the time

i would bang the gu centre in and see how it goes or shim yr original one
Yeah mate, I will slide it in tomorrow and post the outcome here.

BTW, is there a way to modify an open diff to lock it manually when needed. I won't even mind having to crawl under the back of the car to turn it on and off.
If you lock the spider gear, that basically is a locked diff, isn't it?
Isn't there a way to do this manually?
I think, it can't be that hard to devise a method to do that, even though it puts stress on spider gears.
What do you think?
Diff locking is only necessary when you drive on or get stuck on mud, etc. Am I right about that?
 

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Discussion Starter · #15 ·
This is the smaller LSD pack version of the H233B 4.375 rear LSD diff.
I've been told by another local diff specialist.
It's much weaker than the old GQ LSD centre.
The clutch plates were roughly about half the size of a GQ one, in these GU ones.
So, they break/wear easily/quickly he said.
So, it's only good as a temporary one for a GQ I reckon, but an expensive temp diff. :doh:
 

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Yep they are GU rear diffs. As others have said the newer models have the smaller lighter LSD hemispheres than the big GQ hemis. Presumably Nissan did this to reduce drivetrain weight in the interests of better fuel economy and on road manners. When I changed my ratios on my GU I rebuilt a GQ LSD and fitted it at the same time.
 

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Dom14 are any of these for sale?
 

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Discussion Starter · #18 ·
Dom14 are any of these for sale?
Hi Sim79,
Yes, GU one will be, but not right now. I need it as a temp to get around.
As soon as my GQ is completely rebuilt, GU one will be ready to end up with somebody
else. I can't think of a reason to keep it. I reckon it might take me couple of weeks to sort out the old one.
 

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Hi Sim79,
Yes, GU one will be, but not right now. I need it as a temp to get around.
As soon as my GQ is completely rebuilt, GU one will be ready to end up with somebody
else. I can't think of a reason to keep it. I reckon it might take me couple of weeks to sort out the old one.
Where are you located? And how much will you want for it? You can pm me the price if you don't want to post it up
 

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Discussion Starter · #20 ·
Where are you located? And how much will you want for it? You can pm me the price if you don't want to post it up
I'm in Melbourne mate. If that suits you, send me a private message with your number.
I will sms you once my old GQ diff is ready to go and this GU one can be pulled out of my GQ. The flange will be the GU flange. We can discuss the price once it's out of my GQ & if you are still interested in it.
Cheers
 
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