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Thread: 10 bolt diff

  1. #1
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    Default 10 bolt diff

    Iím gonna run a 10 bolt diff with a LS. If I put a good LSD in it. Itís not gonna be a trac car, might just get a boot around town every now an then. How long does everyone think this will last, or will it be ok?


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    Hi
    10 bolt diff are a cone plate and spring type diff .
    I sourced mine from a guy who was upgrading to a chev/9inch 25yr ago . The housing had loose / broken some of the bolts . Housing was fine but required all new components .
    Other people have problems with the pinion cross shaft.

    The diff centre /carrier hubs were mostly only fitted to only few high performance vehicles in the USA ,most were only 250-300hp . Probably were a standard issue diff in the early days .Later years many were 12 bolt apparently far superior . Speak to people in the diff industries the 10bolt is great as a standard diff but not for high performance .

    Every thing in the 10bolt is under designed for performance

    Continuous burnouts will kill it eventually then it will be open wheeler type and that's it if its not broken
    U can put a tru trac in and if I remember correctly 28 spline axles . I would imagine the housing and crown wheel and pinion not be up to it . Where do u stop upgrading !!

    The early 9 inch housing /centre is ok for around 350hp
    The standard factory type nine inch housing/centre is suitable for say 450hp if in good condition
    31 spline with heavy duty housing/centre 600hp
    35 spline with heavy duty housing/centre 750 hp
    All Strange diff parts etc all the recommendations are from Strange and Australian diff shops . Check out the Strange site and Pdf

    A basic 9 inch is around 3000 own drums / Factory Ford clutch type 9inch ,, up to 4000 eaton true trac etc basic new centre
    9inch with 99% street quality gear custom axles 5000--5500 600 hp set up

    Avoid the No name China parts in your diff. I found a few diff shops and they don't like fitting main stream parts , because there`s slim profit I imagine .

    Others will chime in and hopefully have experience with hi po 10bolts
    Last edited by swampy; 09-01-2018 at 01:02 AM. Reason: none

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    I assume you mean the Australian 10-bolt, the one Swampy is talking about (US sourced) is a different diff, which we got here in HK-HG Holden.

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    It should be OK, can't really vouch for the LSD as I could never afford one but....

    Years ago I raced a HZ Tonner with a 454 and N20, I got to a point were I would break a standard or Tonner axle every 3 passes and about every second or third meeting the pinion would force the crownwheel out through the rear cover. I was using a welded open centre. This was about 20 years ago so 4.44 gears and axles were cheap. At this stage the car was running mid 10 sec quarters. I ended up giving up on the Salisbury and fitting a 9" with 1x 28 spline axle and 1x 31 spline axle with a standard LSD centre. The car went on to run mid 9's as I could give it more N2O off the line.

    A few years ago I was racing an HQ sedan with a N/A SBC. It was running 11.0's with a standard Salisbury with standard sedan axles and a Romac full spool. I never had a problem with it. I later sold the car and the diff ended up in a mates 6L LS2 T56 powered HZ and is still going today.

    Hope this helps.

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    Ok thanks mate. Yeh gonna put a tru trac in with 3.55 gears. Well Iíll see how it goes. If I have any problems Iíll just go with the 9Ē


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    A true trac and a set of tonner axles or even a set of billet axles if you are really worried and you will be fine. I give mine a regular canning with my 355 and it has never let me down. The truetracs are a beautiful bit of kit too, smooth as silk.

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    had a factory LSD in the back of the VH many years ago, 180rwHP at the time, catastrophic failure late one night, shredded all gears and bearings and locked up the rear end and parked it in the gutter.
    was too expensive to fix at the time (apprentice wages), so ended up putting in a mini spool, which is fine for the use it gets these days, minimal.

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    Quote Originally Posted by cross8 pat View Post
    A true trac and a set of tonner axles or even a set of billet axles if you are really worried and you will be fine. I give mine a regular canning with my 355 and it has never let me down. The truetracs are a beautiful bit of kit too, smooth as silk.
    Hi, would you know the measurement difference between one Tonner axels an standard axles? Please. I donít wanna get stuck buying standard axels.


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    They are obvious. Rest are smaller than the spline. Tonner are massive and machined down to the spline size at the end.

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    Hi
    HK1837

    The axle shaft for 95% sounds strong until it steps down .

    To step upto an Eaton trutrac the axles are upgraded to 28 spline . The std Salisbury has less splines ??? That's at least how I remember the conversation with Altrac 9 .

    The 10 bolt being suited to around 400--450 hp with the upgrades

    The HQ--HZ 10bolt was often reffered to being the same as the usa unit by the better diff shops when I was considering a rear diff option .



    Bradegar90

    The best over the phone for diff shops were Melbourne based

    Geelong diff s
    Keysborough diffs
    The above CANNOT supply billet axles
    Ring these people to see if they can do conversion /upgrade


    Mcdonald bros
    John Taverna chassis
    Can supply custom anything

    Altrac was hard to speak to the owner always leave message WTF !!!
    Quote was all over the place even after we talked , he doesn't listen to well .
    Last edited by swampy; 13-01-2018 at 09:10 PM.

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    HQ-WB V8 and cab chassis salisbury are all 28 spline. The only one with less is WB 6cyl ute and van.

    Aussie 10 bolt is very different to US example. The earlier US 10 bolt are actually an Eaton clutch type LSD. They are only used up to about a 260hp engine. GM had the far bigger 12 bolt for heavier duty use, saw action here in Norm Beechey’s Monaro and Bob Jane’s Camaro in Group C touring cars in the early 70’s. These cars had in excess of 600 hp and big slicks.

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    hi

    HK
    There must be some similar dimensions /housing etc . The hemisphere might be different . The advice I was given was the Tru Trac idea came from the usa and we just use it here in the ozzy units . As with most holdens just a variant of what the usa used in any of the GM brands .

    The ealy usa 10 bolt Eaton clutch type metal cone type or fibre disc like 9 inch ??

    Where did the ozzy cone clutch set up come from ?? Another GM product or Borg warner etc or 100% ozzy GM which I dought ?? [rebranded most likely] .

    Is the GTS references in Hq manuals to B/w [borg warner] diff just refering to the LSD hemisphere???
    Last edited by swampy; 13-01-2018 at 11:20 PM.

  13. #13
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    As HK said Aussie 10 bolt has no interchangeable parts with US 10 bolts. The only Tru Track available is the Harrop one that they make a hemisphere and fill it with Tru Track internals. It comes either to suit standard/aftermarket 28 spline axles or optionally to suit aftermarket 31 spline axles.

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    Hi
    There is a huge variation amongst USA 10 bolt , 7.2thru 8.6 crown wheel size
    C clip / non C clip axle retaining
    posi traction

    I doubt think the diff shops in oz have explored it much as they all seem to be 9 inch only .

    Also many of the GM parts were installed on Ozzy Holdens Chevy Pontiac Corvette Buick [some times the most unlikely parts ]

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