Which diffs interchange?

[Deevo]

2006, TD42ti wagon with 285 tyres. I want to swap diffs from 3.9s to 4.1s. I don't want to fork out money for a 4.1 only to find it doesn't fit and I've done my dough. Can someone clearly tell me how I can recognise/ID a 4.1 diff that will fit straight into where my 3.9s came from before I buy it? I don't care how long winded your explanation is so long as it's helpful. Hoping someone can help, Deevo.

[mudski]

You need to know what rear diff you have first. H260 or the smaller H233b. Just count the number of bolts holding the centre in to tell. H260 has 12 and the H233 has 11.
Fronts are the same. Dont get centres from a ute. Even if they are the same centres as you. Because the utes use a smaller axle spline in the rears. So they must be from a wagon.
Otherwise its very straight forward.

[MudRunnerTD]

You have a H233 in your GUIV TD42Ti

[mudski]

You have a H233 in your GUIV TD42Ti
Easy then. Just look for H233 front and rears. But not from a ute though...

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[the evil twin]

Easy then. Just look for H233 front and rears. But not from a ute though...

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Thats 'cause Utes are special and awesome and need lots of hugs so we don't play well with Wank... I mean Wagons

[mudski]

Thats 'cause Utes are special and awesome and need lots of hugs so we don't play well with Wank... I mean Wagons
And special people drive utes....lol

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[the evil twin]

And special people drive utes....lol

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ROFL, yep, only need two seats in my ride, one for me and one for Chewy.
Altho Chewy does tend to eat bits and pieces of his... but I don't mind... there is just no negotiating with 50 Kilos of pissed off Alsatian

[threedogs]

ROFL, yep, only need two seats in my ride, one for me and one for Chewy.
Altho Chewy does tend to eat bits and pieces of his... but I don't mind... there is just no negotiating with 50 Kilos of pissed off Alsatian

did you say special or special needs ppl drive utes ? LOL

[BigRAWesty]

http://www.nissanpatrol.com.au/forums/images/imported/2015/12/85.jpg


Anywho..
If the diff is still in the car you will see on the Vin number what ratio it is.
Given that the diffs are original.
If they are out then simply count the main crown gear teeth and devide that by the smaller pinion gear teeth..
That'll give you the ratio.

[Deevo]

Thanks for that Mudski. My diffs are HG39 with 11 bolts so therefore I have H233 diffs with a 3.9:1 ratio. They are the original diffs (I've had the car since new). If I'm understanding you correctly, this means I can safely buy any 4.1 diff and expect it to bolt straight into the respective banjo (whether it be front or rear) providing it is NOT out of a ute. Correct? Thanks for your help -it's what I was after.

[mudski]

Thanks for that Mudski. My diffs are HG39 with 11 bolts so therefore I have H233 diffs with a 3.9:1 ratio. They are the original diffs (I've had the car since new). If I'm understanding you correctly, this means I can safely buy any 4.1 diff and expect it to bolt straight into the respective banjo (whether it be front or rear) providing it is NOT out of a ute. Correct? Thanks for your help -it's what I was after.

You need to get one front and one rear. Not two of the same... as the rear has the LSD and the front doesn't. As far as I'm aware the fronts are the same from ute to wagon.

[BigRAWesty]

Also the fronts are a 31 tooth spline axle and the rears are 33.. (note, that's in the gq.. I'll check my gu diffs once home)
So you'll definitely need a front and rear set.. regardless of lsd or open. .

[mudski]

Also the fronts are a 31 tooth spline axle and the rears are 33.. (note, that's in the gq.. I'll check my gu diffs once home)
So you'll definitely need a front and rear set.. regardless of lsd or open. .
yep. Rear will be lsd and front not.

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[JME_GU]

Sorry to hijack the thread, but will an LSD rear fit in a front? If so, it seems like an easy way to get better front traction.

[Kimbo63]

Hi Deevo
You can find the ratio stamped on the crown wheel might come in handy if buying s/hand diff
Cheers kimbo

[GQ TANK]

Depending on the model a rear lsd centre can be put in the front

I have a rear H233b lsd from a mk wagon in the front of my gq as the both have the correct spline count on the axle. To retain the correct ratio, I swapped the ring gear from the gq front.

You cannot put a lsd from the rear of a gq in the front of a gq different spline count. Also, it is a good idea to have manual uubs, to prevent wearing out the lsd on ashfelt