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Thread: Trutrac Install

  1. #1
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    Default Trutrac Install

    Hey guys.
    Ive just recently bought a new Trutrac lsd from harrop for my 10 bolt in mt Vh so now i can finally ditch the ciglocker.

    I have never done a diff center change before.

    Is there any special tools, parts and procedures i need to have/ do so i can complete the job in 1 day?

    Ive done my axle bearing recently so i wont need to do them whilst they're out.

    Thanks
    Last edited by Justin_; 16-11-2017 at 08:43 AM.

  2. #2
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    You need a dial gauge to check the backlash and some of the special yellow grease to check the pattern. Ideally a torque wrench for the crown wheel bolts (LH thread) and bearing caps.

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    Quote Originally Posted by immortality View Post
    You need a dial gauge to check the backlash and some of the special yellow grease to check the pattern. Ideally a torque wrench for the crown wheel bolts (LH thread) and bearing caps.
    Bearing caps?

    Dial gauge i unfortunately dont have.

    Ive just read elsewhere that new carrier bearings and new shims are required?

  4. #4
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by Justin_ View Post
    Bearing caps?

    Dial gauge i unfortunately dont have.

    Ive just read elsewhere that new carrier bearings and new shims are required?
    I would change the carrier bearings (and pinion bearings) unless relatively new
    and shims? will need them as required when setting the pinion crownwheel tooth pattern

    if you have not done this before ( and there are a couple of other special tools required)
    ... I would suggest a professional diff shop to do the centre change
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    Anyone know the carrier bearing part number?

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    Sure why not? 76lxhatch's Avatar
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    If you check the backlash before and match it after, you don't need to bother checking the tooth pattern because it will be the same. You can use bearing blue or similar to check the tooth pattern if need be, just not as easy to see.

    It all depends on how accurate the original carrier is, compared to the new Truetrac. If they are absolutely identical then you'll just be able to drop it in with the same shims and it'll be good to go. You do need to be able to check this though and the dial gauge is the easiest way. If its not the same then you'll need to replace/alter the carrier shims to get the correct blacklash and bearing preload.

    The backlash absolutely must be within spec, ideally as close as possible to what it is now.

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    Doesnt sound promising to be able to do it in my garage.

    The diff was all set up 2yrs ago after the stock 10 bolt lsd failed. So a welded open center, New gears, bearings, backlash and preloads were all done and set by a reputable diff shop. However im not sure about the shims if they were the existing or new.

  8. #8
    Sure why not? 76lxhatch's Avatar
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    No worries to do in the garage (with a little care), but you do need a dial gauge to check the backlash. And if it needs changing, some shims.

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    So the backlash is the movement of the carrier from side to side which then affects the mesh of the ring and pinion?

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    I might just bite the bullet and get a dial gauge and some carrier bearings.
    As for shims..where can they be sourced from?

  11. #11
    Not the Kingswood! hq308's Avatar
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    Backlash is how much the ring gear moves (rotates) with the pinion stationary.

  12. #12
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    As above the backlash is the amount of gear rotation before contact, because of the shape of the gears this is adjusted by moving the carrier side to side which is where the shims come in. The carrier itself should not move side to side once installed, in fact there should be a small amount of bearing preload.

    Get the shims from wherever you can find them, a diff shop would be the first place to ask but they don't need to be diff specific, just have to fit.

  13. #13
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    Did a bit of shopping.
    I got some new Timken Carrier Bearings SET 47 LM102949 (factory size is SET 69, Harrop actually advised the bearings are that of a Ford 9" as the factory 10 bolt lsd where the bearings are pressed on to is smaller therefore the bearing ID is now larger with the TrueTrack but the OD remains the same).
    A new dial gauge with magnetic base,
    Gasket, locktite and some
    Penrite Mineral gear oil 85-140, is the 85-140 to thick?
    I wouldve thought their 80-90 wouldve done the job?

    Still struggling to find shims and a specialised diff shop as im only new to this area and the likes of ebay has none.
    Last edited by Justin_; 17-11-2017 at 07:34 AM.

  14. #14
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    80/90 would be the usual oil but 85/140 will be fine for an old gearset, I often use something a little thicker to keep things quiet.

    An engineering/machine shop should be able to supply the shims too but you''ll probably need to know what thickness(es) before you ask and may cost more if they have to machine them. They don't have to be perfect in terms of inner/outer diameter as long as they can't go anywhere and clear the axles and bearings/caps.

  15. #15
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    I got new shims made up by a mate who is a machinist. Gave him one of the old ones to copy and the thickness I wanted.

    Sent from my SM-G901F using Tapatalk

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