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2.77 myths..


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#1 xdcy8

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Posted 25 April 2009 - 09:23 PM

is it true that 2.77 diff housing's are different to the 2.92 diff housings?

#2 xf-087

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Posted 25 April 2009 - 09:37 PM

apparently

the triton lives again with some added extras lol


#3 n00bus m@x1mus

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Posted 25 April 2009 - 09:49 PM

Not 100% true, but.....

0575 housings are different from 0578 housings
All 0575 housings in falcons are of 2.72 and 2.77 varieties and all falcons from 2.92 upwards are of the 0578 variety and only there respective hemisheres and cogsets will bolt straight in, there are shims and machine work that can be done to blend the to different varieties together but it is a lot easier to just start with a 0578 housing.
also 0575 diffs are only 25 spline but 0578s came with both 25 and 28 spline centres.

There are other makes that employ the borg warner rear besides ford and holden, one being the skylines/pintaras and another are valiants and do have shorter gears with 0575 cogsets and hemis but are a lot harder to find and more sought after than a 0578 set which can be found in any falcon EA onwards and most V8 models of XD/Es will be 0578 hemis with 28 spline.

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#4 xdcy8

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Posted 25 April 2009 - 11:33 PM

The diff in question came from a zl fairlane if that is any help

cheers
al

#5 P100_Ute

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Posted 26 April 2009 - 03:43 AM

Posted Image

2.77 Diff will take 2.77 and 2.77 LSD centers only..
a 2.92 Diff will take like 2.92/3.23/3.5/3.7/3.89/4.11

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#6 Trevor 57

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Posted 26 April 2009 - 07:05 AM

is it true that 2.77 diff housing's are different to the 2.92 diff housings?

The housings are the same, but the gear carriers are different.


Whoops I should have scrolled down further before posting - nice pic

Edited by Big Trev, 26 April 2009 - 07:06 AM.
should have scrolled down


#7 n00bus m@x1mus

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Posted 26 April 2009 - 07:22 AM

The housings are the same in respects the hemi or carrier, they will bolt straight in, however its the pinion gear that is the difference, the 0575 cogset has a taller height and larger diameter pinion gear and is let forwards in the housing compared to the 0578 cogset to allow the gears to mesh. You can fit 0578 gears into a 0575 (zl/xf ghia lsd) housings by shimming the pinion gear backwards towards the crown by the required amount, (i cant remember off the top of my head but i thinks its around 1.2mm) this shim goes between the front face of the cog and the back face of the roller bearing. I have fitted 0578 - 3.45:1 gears from a VN ute into my 0575 housing and installed the shim to get allignment. You can machine the same amount out of the 0578 housings to take the 2.77 gears and hemi but i cant see why you would want to.
Thanks for the pics, i had wished i had taken pics when i had them side by side, it makes it so easier to explain :hy:

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#8 Mat-Attack-Racing

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Posted 26 April 2009 - 08:04 AM

The housings are the same in respects the hemi or carrier, they will bolt straight in, however its the pinion gear that is the difference, the 0575 cogset has a taller height and larger diameter pinion gear and is let forwards in the housing compared to the 0578 cogset to allow the gears to mesh. You can fit 0578 gears into a 0575 (zl/xf ghia lsd) housings by shimming the pinion gear backwards towards the crown by the required amount, (i cant remember off the top of my head but i thinks its around 1.2mm) this shim goes between the front face of the cog and the back face of the roller bearing. I have fitted 0578 - 3.45:1 gears from a VN ute into my 0575 housing and installed the shim to get allignment. You can machine the same amount out of the 0578 housings to take the 2.77 gears and hemi but i cant see why you would want to.
Thanks for the pics, i had wished i had taken pics when i had them side by side, it makes it so easier to explain :hy:


(i cant remember off the top of my head but i thinks its around 1.2mm)
1.1 new 1.4 used so 1.2 is close enough lol
your a walking encyclopedia or part manual arn't you mate :hihi:
isn't one a 2 pinion and one a 4 pinion type or can they both be either?

#9 Daniel351

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Posted 26 April 2009 - 08:27 PM

fark it.. so that mean's i cant get 3.45s and bolt them into my 2.77 LSD?

so ill need to get a 2.92 LSD and put the 3.45 gears onto it?

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#10 jeffb5.8

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Posted 27 April 2009 - 04:49 PM

I have a 2.92 diff and i know a wrecker mate that has a few BW diff's from skylines and pintaras.

Can i use the gear sets (crown & Pinion) from them to rebuild my diff to say a 3.45?

Is there any way of telling if i have a 25 or 28 spline axle without pulling them out.

Sorry for the thread hijack

#11 crazy2287

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Posted 27 April 2009 - 06:37 PM

can the LSD gear be swapped between the 2? (0575 > 0578 n vice versa)
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#12 n00bus m@x1mus

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Posted 27 April 2009 - 07:17 PM

can the LSD gear be swapped between the 2? (0575 > 0578 n vice versa)


No, you can see the offset difference in the pic above, its about 8mm offset to the gear face and about 6mm offset in the teeth mesh.

With that shim, i had 4 made up in varying thicknesses, between 1.55mm (0.0610") and 1.58mm (0.0620") and i ended up using one at 1.57mm (0.0618")
This got my 0578 3.45:1 gears and hemi into my 0575 housing.
So a little thicker than i first thought but i was told 61.5 thou and i got a few either way and found this one to best suit the wear in my setup.

Edited by n00bus m@x1mus, 01 January 2011 - 07:37 PM.

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#13 aworth1

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Posted 02 May 2009 - 04:46 PM

iv got a xf with a 2.77 diff so wat ur saying in the end if i wanted to put a 4 pinion lsd 3.08 diff center in id have to change the diff housing??????????????

#14 Thom

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Posted 02 May 2009 - 05:30 PM

short answer yes
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#15 aworth1

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Posted 02 May 2009 - 05:33 PM

**** umm so i couldnt get a lsd and chande the crown wheel and pinion over?

#16 n00bus m@x1mus

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Posted 02 May 2009 - 06:06 PM

If you have an 0578 2.92 or higher LSD diff and you wanted to put 3.08s in then yes you can do that.

If your diff is the standard XF or ZL LSD with 2.77s then it will be an 0575 series housing and cogs and hemi and you will need to do some machine work, have another read thru the thread, it covers all bases, if you really want (or have) 3.08 cogs then get your self a 2.92 with LSD from either a XF ute or EA wagon for leafs or manual XF sedan or any EB or later sedan for coils.

Hope this helps :hy:

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#17 aworth1

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Posted 02 May 2009 - 06:17 PM

so pretty much i cant do nothing unless changing diff housings over to put 3.08's in on a lsd but can go from 2.77:1 2.78:1 2.92:1 3.23:1 3.50:1 in a single spiner

#18 Stretch

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Posted 02 May 2009 - 06:22 PM

so will pintara gears fit in the 2.77?
What ratio did they run 3.5 and 4.11?

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#19 aworth1

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Posted 02 May 2009 - 06:27 PM

yeah 4.11 and 3.5 i know they fit in vn"'s not sure about xf's

#20 n00bus m@x1mus

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Posted 02 May 2009 - 06:51 PM

If there 0575s they should stretch, i have never seen a set but i guess if the numbers line up then they should bolt straight in. I know vals came with borgys too but im not sure on ratios.
they might be 25 spline too being a lightweight body so you can use ur axles too.

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