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  1. #1
    YES, IT VIBRATES!!!! VIBR8R's Avatar
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    Default Help borg warner diff info???

    Right, Im over google and cant find what I am after. Can anyone tell me the spline amount of the pinion gear to yoke, what series uni fits the joint 1310 etc? from end of tailshaft to flange that bolts to diff flange and is this classed as the GM 8.5 inch diff?
    Basically Im going to run 1350 series uni's/yolks with the new tailshaft im getting built but dont know if there's a 1350 series yolk that will fit the Borg Warner or if I have to get a reducing uni (1350-1310? etc) to suit the the uni size I have now?
    I ask these questions as I recon i'll buy all the uni/yolks myself out of the states and have it put together here.
    DRINKING DOESN'T CAUSE HANGOVERS, WAKING UP DOES!!!!

  2. #2
    Try not to shit me please ahk068's Avatar
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    Spicers in Hobart built my tailshaft which is 3.5" with big uni's. I remember the diffflange was an issue but they got around it. Give them a call
    I'm far stupider than you realise

  3. #3
    YES, IT VIBRATES!!!! VIBR8R's Avatar
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    Quote Originally Posted by ahk068 View Post
    Spicers in Hobart built my tailshaft which is 3.5" with big uni's. I remember the diffflange was an issue but they got around it. Give them a call
    Out of interest can I ask what they stung you to have it done, and what sort of power will it support?
    I called in there the other day and had a chat to them, he admitted that it'd be cheaper to get the gear myself and have them put it together, but the basic "come back when your ready to build it and well go more indepth".
    DRINKING DOESN'T CAUSE HANGOVERS, WAKING UP DOES!!!!

  4. #4
    Try not to shit me please ahk068's Avatar
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    $700 with billet front yoke from memory. They didn't give me power figure but reckoned the diff would break first
    I'm far stupider than you realise

  5. #5
    Sure why not? 76lxhatch's Avatar
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    Quote Originally Posted by VIBR8R View Post
    is this classed as the GM 8.5 inch diff?
    The yanks call the M78s a 9 bolt, a bit of info on Camaro forums and the like

  6. #6
    YES, IT VIBRATES!!!! VIBR8R's Avatar
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    So does anybody know what I need to do to join a 1350 series uni to the borgwarner diff or done this before?
    This is what I'm having trouble finding out?
    DRINKING DOESN'T CAUSE HANGOVERS, WAKING UP DOES!!!!

  7. #7
    Do you ever leave? Mickss355's Avatar
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    Mate why you spending good money on a borg warner ?????
    Put a 9 inch in it and forget its there !!!!!!

  8. #8
    YES, IT VIBRATES!!!! VIBR8R's Avatar
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    Quote Originally Posted by Mickss355 View Post
    Mate why you spending good money on a borg warner ?????
    Put a 9 inch in it and forget its there !!!!!!
    Because the Borg Warners got a full spool with 31 spline moser axles and cost me 2 grand to build completely new a year ago, the same in the 9 inch everyone wanted $3,500 to $4,000 which I didnt have.
    The BorgWarner is weak stardard yes but this is well from standard. I have seen 9 and 10sec VLT's running this setup no probs.
    Still looking for an answer, surely someones done this before?
    Last edited by VIBR8R; 19-07-2010 at 04:17 PM.
    DRINKING DOESN'T CAUSE HANGOVERS, WAKING UP DOES!!!!

  9. #9
    Try not to shit me please ahk068's Avatar
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    Bw is a fair bit lighter too
    I'm far stupider than you realise

  10. #10
    Do you ever leave? Mickss355's Avatar
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    Surely if you ring a diff place they could tell you what you need to know ???????

  11. #11
    YES, IT VIBRATES!!!! VIBR8R's Avatar
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    Quote Originally Posted by Mickss355 View Post
    Surely if you ring a diff place they could tell you what you need to know ???????
    Mick I have rang a couple diff places and they all say the same "when your ready to build it bring it in and sort it out then".
    Id like to find this out for myself, so I can buy all the parts then have it assembled, maybe I just buy everything else and leave it up to the builder just dont want to be slugged a rediculous amount for that particular problem.
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  12. #12
    Sure why not? 76lxhatch's Avatar
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    I'm using the larger pinion flange and rear uni from a Falcon which appears to be about the same as what you'd commonly get with a 9 inch, much bigger than the standard Commodore one anyway. It fits the Falcon 7.8 inch gearset pinion it came from as well as the Commodore and Skyline 7.5" gearset pinions I've used.

    If you're still stuck tomorrow I'll climb under there and measure the uni, I probably also have a spare pinion somewhere which I can count the spline on.

  13. #13
    YES, IT VIBRATES!!!! VIBR8R's Avatar
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    Quote Originally Posted by 76lxhatch View Post
    I'm using the larger pinion flange and rear uni from a Falcon which appears to be about the same as what you'd commonly get with a 9 inch, much bigger than the standard Commodore one anyway. It fits the Falcon 7.8 inch gearset pinion it came from as well as the Commodore and Skyline 7.5" gearset pinions I've used.

    If you're still stuck tomorrow I'll climb under there and measure the uni, I probably also have a spare pinion somewhere which I can count the spline on.
    Thanks a million, just the info I was after. That'd be great if you could do that, if you have the time.
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  14. #14
    Sure why not? 76lxhatch's Avatar
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    OK I might have to eat my words - I was sure the Falcon uni was larger than the Commodore one when I put it in, but the measurements don't seem to support that. Perhaps the bulk of the different style yoke makes it look bigger - you can just see it on the floor at the bottom of the pic above. I got a driveshaft from a Falcon ute (I think) which was 3" OD and I was planning to just change the front yoke but it turned out that it had a second damper tube rubber bonded inside it so shortening would have been difficult. Instead I got a new rear yoke to suit the uni for the existing driveshaft.

    Anyway some details:

    Falcon uni 27mm/1 1/16" OD cups, approx 81 to 82mm outside size of cross (very hard to measure in car sorry)

    Commodore uni same size cups, 80mm outside size (so given a decent margin of error could even be the same uni)

    For reference Holden V8 tailshaft end I have lying around from TH400 and not sure whether standard or tonner diff yoke has same cups and 84mm outside size

    Borg Warner pinion is 27 spline, with an OD of approximately 29.7mm. The Falcon, Commodore and Skyline ones I have here are all the same.

    Note if you are going for all-out strength the Falcon diff I have here used a bigger rear pinion bearing and had the 7.8 inch crownwheel as opposed to the regular 7.5 inch one. It also has tapered profile teeth on the crownwheel as opposed to the straight profile on the Commodore and Skyline gearsets.

    The larger Falcon pinion yoke/flange on the diff has to be a good thing either way, would be easy enough to bolt a much larger uni to that.

  15. #15
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    I get the jist of what ya want to do and can only suggest you call Romac as much as I hate to send you there.
    You could get it made from someone like Hardman brothers if you draw it up, they have made that kind of thing for me before.
    Diff guys aren't gonna hand over there hard earned knowledge that easily unless you have spent money with them before
    A mate of mine has a VL turbo shitbox, but it runs 9.4's at 151mph on the standard flange and has a transbrake fitted with a 5200 rpm converter. he has the same axles as you and a full romac spool, I did his diff and trans a few months back. it will probably go a fair bit quicker yet so we'll wait and see what breaks.

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