I also have always heard the live axle in the commodore is bw78
Fitting a R31 Skyline B/W diff to LH/X
Started by
_rorym_
, Aug 10 2008 11:00 AM
310 replies to this topic
#227
dattoman
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Posted 17 May 2013 - 01:15 AM
Yep... heard it too... and believed it for years
But I worked for a Dana/BTR/BW distributor last year and sold alot of gearsets and parts for them
And they were all BW75's
Check the C+P for the markings
I'm sure others will confirm or refute.. .and I'm happy to be wrong
I have a copy of a spreadsheet I came across made by a guy who worked for BTR back in the day that I'm basing my remarks on
#228
TerrA LX
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Posted 17 May 2013 - 01:34 AM
Send it over please.
#229
ls2lxhatch
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Posted 17 May 2013 - 02:09 AM
News to me too so I had a look in "60 Years of Holden".
VL - BW M75, Small and Large Salisbury
VN - BW M75
VP - BW M75. BW M76
VR - BW M75, BW M76
VS - BW M75, BW M76, BW M80
VT - BW M76, BW M80
VU - BW M80
VX - BW M80
VY - BW M80
VZ - BW M80
I couldn't find the specs for the one tonners.
Edited by ls2lxhatch, 17 May 2013 - 02:10 AM.
#230
View GaragePosted 17 May 2013 - 07:11 AM
Haha, finally someone who agrees with me! Measure the crownwheel diameter from any live axle Commodore Borg Warner and you get 7.5", thats an M75. Measure one from an EF or so Falcon and you get 7.8", thats an M78 (although the M75 and M78 gearsets share the same internal diameter and thus centre unlike the M80).
Don't try to tell the Commodore boys this though, they will tell you until they're blue in the face that being 4 spider/28 spline makes it an M78.
Don't try to tell the Commodore boys this though, they will tell you until they're blue in the face that being 4 spider/28 spline makes it an M78.
#231
Dr Terry
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Posted 17 May 2013 - 09:52 AM
I couldn't find the specs for the one tonners.
The Crewman & One Tonner live axle diffs were designated as Dana brand. The V6 had an M78 centre & the V8 had an M86. This was mentioned in the text section of VY but didn't make it to the diff chart.
These days BW & Dana are one in the same.
Dr Terry
#232
ls2lxhatch
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Posted 17 May 2013 - 10:31 PM
Thanks for the info.
#233
TerrA LX
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Posted 18 May 2013 - 03:18 PM
^ Ditto
#234
Uncle Chop Chop
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Posted 22 May 2013 - 08:42 PM
So did Ford always run the 78 series from the XD or from a different model?No Commodore diffs are BW78's
They are all BW75's... unless its a VZ ute.. .then you got a 78
Skylines are 75's also
Fords have 78's in them
Its written on the crownwheel
0575 for a 75 series
0578 for a 78 series
#235
dattoman
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Posted 22 May 2013 - 09:34 PM
My Dana info starts at Ford EA
Prior to that weren't that a different style of BW unit ?
Similar but not exactly the same
Though my bearing kit listing is same from XR-EA BW75
Alot of EA-B were still 75's
So no not all Fords are 78's... though MOST from EB series 2 on were... but not all
#236
Posted 22 May 2013 - 09:45 PM
Up to XF at least were M75s (two spider 25 spline variety). Not sure how far they go back but even a lot of the Valiants had these as well
#237
_UCA350_
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Posted 11 June 2013 - 10:47 PM
I just got quoted $1,600 to remove and add all pick up points to the R31 borg warner diff, Banjo supplied, new bearings, fill and redrill axles and discs to Torana stud pattern ready to bolt in by Difftrans, Windsor,
Is this about right as it's a ittle more then I was expecting?
#238
TUF 308
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Posted 12 June 2013 - 05:30 PM
hmm sound expensive to me, then again mine was done 6 years ago
$660
$660
#239
SmacT
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Posted 13 June 2013 - 10:57 PM
A bit expensive. I just had something very similar done to a cdore BW, except for the axle stud filling and drilling, though I needed the housing shortened and had the LSD machined all for $1200. I would have thought 1100 for yours. Give Ian a ring at Kreative Enterprises in Windsor for a quote. He's great to deal with and knows his stuff. He's a qualifier engineer too.
#240
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Posted 17 June 2013 - 09:57 PM
A little after getting my first quote I remembered buying some parts of Luke who works at Kreative Enterprises, I have been in contact with him and I should have a price Tuesday.
#241
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Posted 21 June 2013 - 04:21 PM
Quote from Kreative Ent for R31 skyline borg warner diff to Torana
It worked out cheaper to supply the brackets from McDonald brothers at a cost of $250.00 rather then find a old Banjo or useing your own banjo.
I dealt with Luke, very freindly and helpful.
Remove brackets from Borg Warner which you could do yourself: $100
Stripping of diff which you could do yourself: $100
Welding of new brackets onto Borg warner: $300
Fill and redrill axles to Torana stud pattern: $150 each
New Bearings: $60 each
Re stud Discs to Torana stud pattern: $100 each
$1120 or $920 if you do a little work yourself, $800 if you reuse/repack the bearings.
#242
TUF 308
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Posted 24 July 2013 - 04:52 PM
I have a idea, EA falcon watts linkage diff hat fitted to skyline diff? Would the falcon diff hat fit skyline diff?
#243
TerrA LX
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Posted 24 July 2013 - 07:41 PM
AFAIK the hats are interchangeable.
If there is room between the diff, tank and exhaust for a ford watts link is another story.
#244
Uncle Chop Chop
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Posted 24 July 2013 - 09:08 PM
There are also aftermarket Watts Linkage kits for BW diffs.
#245
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Posted 24 July 2013 - 09:55 PM
Hmm food for thought, is the effort worth it for a street car?
#246
Posted 24 July 2013 - 10:26 PM
I have one of the Falcon covers and was planning to use it one day (not enough room there but that can be resolved). However I did a few measurements recently and the Skyline diff centre doesn't sit in the right spot - the centre pivot would end up significantly off to one side so it won't work. If I ever get around to a watts link I think I'd mount the outer ends to the diff and the centre to the body/chassis.
#247
_a.vas_
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Posted 15 February 2014 - 03:49 PM
Hi guys,
just in the middle of this conversion and the bolt head on the hand brake lever fouls the shock! Any simple ways to get around this??
cheers
#248
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Posted 15 February 2014 - 05:39 PM
btw using r31 housing with r31 calipers and backing plate
Hi guys,
just in the middle of this conversion and the bolt head on the hand brake lever fouls the shock! Any simple ways to get around this??
cheers
#249
_Lazarus_
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Posted 15 February 2014 - 07:52 PM
On the subject of the Watts Link wouldn't you want parallel upper arms for this to work properly ?
#250
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Posted 15 February 2014 - 08:17 PM
Hi Anthony, I had same problem fitting these discs to a shortened 9", I redrilled the calliper brackets to the only possy they don't foul on anything = around 4--5 o-clock position, Which also made the standard LJ handbrake cables the perfect length... So using the BW maybe all that's needed it to elongate the 4 holes to move bracket slightly......
Edited by WhaleOilBeefHooked, 15 February 2014 - 08:18 PM.
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