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Thread: Ashcroft center ATB differential

  1. #1
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    Ashcroft center ATB differential

    Iím just about to push the go button on an ASHCROFT ATB but want to understand how they work and how robust they are for such a small package and are they internally the same design principle as an Eaton Trutrac Y/N?
    1999 build D2 TD5 AT, Mantec snorkel, 2" LRA spring lift, ARB on board air, CMM air ram CDL shifter, swag & gold pans .....

  2. #2
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    They work on the same principle as the trutrac and pretty much the same design.
    From memory the trutrac has 4 pockets where as the Ashcroft has 3, but this has allowed them to have a better bias ratio. ie you can lose a bit more traction before they stop working.
    Mine have worked flawlessly for at least 7 years on my defender and I don't recall anyone having any issues with them, so yeah they are robust.
    Once you pick them up in your hand they feel anything but lightweight.
    In sand you will find that the Traction control has to work so much less than it did before and this keeps you going foward sooooo much more.

    Cheers Glen
    MY12 Defender
    Sold 99 D2 TD5
    When I grew up there were 9 planets.

  3. #3
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    Ashcroft center ATB differential

    Quote Originally Posted by Dorian View Post
    They work on the same principle as the trutrac and pretty much the same design.
    From memory the trutrac has 4 pockets where as the Ashcroft has 3, but this has allowed them to have a better bias ratio. ie you can lose a bit more traction before they stop working.
    Mine have worked flawlessly for at least 7 years on my defender and I don't recall anyone having any issues with them, so yeah they are robust.
    Once you pick them up in your hand they feel anything but lightweight.
    In sand you will find that the Traction control has to work so much less than it did before and this keeps you going foward sooooo much more.

    Cheers Glen
    Thank you, I will complete my purchase with confidenceÖ Ashcroft center ATB differential
    1999 build D2 TD5 AT, Mantec snorkel, 2" LRA spring lift, ARB on board air, CMM air ram CDL shifter, swag & gold pans .....

  4. #4
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    The Ashcroft version actually has 6 gears/side, both the centre and rear diffs. The Trutrac only uses 3/side in Rover spec.

    The TruTrac probably has a better thrust bearing setup for the side gears, but the Ashcroft mimics Quaife's version and seems to work ok.
    I have one apart on the bench atm and the design is fine.

    Make sure you only use a non-LSD fluid, and preferably a GL5 manual transmission/transaxle fluid for best biasing/performance.

  5. #5
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    Ashcroft center ATB differential

    Quote Originally Posted by rick130 View Post
    The Ashcroft version actually has 6 gears/side, both the centre and rear diffs. The Trutrac only uses 3/side in Rover spec.

    The TruTrac probably has a better thrust bearing setup for the side gears, but the Ashcroft mimics Quaife's version and seems to work ok.
    I have one apart on the bench atm and the design is fine.

    Make sure you only use a non-LSD fluid, and preferably a GL5 manual transmission/transaxle fluid for best biasing/performance.
    Would GULF WESTERN 85/140 non friction modified be okay ??
    1999 build D2 TD5 AT, Mantec snorkel, 2" LRA spring lift, ARB on board air, CMM air ram CDL shifter, swag & gold pans .....

  6. #6
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    Way too heavy.
    The t/case only needs an xW-90, especially with the ATB, preferably a 75W-90 as oil feed holes aren't huge.

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    Ashcroft center ATB differential

    Quote Originally Posted by rick130 View Post
    Way too heavy.
    The t/case only needs an xW-90, especially with the ATB, preferably a 75W-90 as oil feed holes aren't huge.
    Thank you,
    I happen to have a dusty 5L container of the afore mentioned Gulf Western on a shelf - looks like itíll languish there for a while longerAshcroft center ATB differential
    1999 build D2 TD5 AT, Mantec snorkel, 2" LRA spring lift, ARB on board air, CMM air ram CDL shifter, swag & gold pans .....

  8. #8
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    Quote Originally Posted by onebob View Post
    Thank you,
    I happen to have a dusty 5L container of the afore mentioned Gulf Western on a shelf - looks like itíll languish there for a while longerAshcroft center ATB differential
    If itís that old, Iíd be sending it for recycling.
    Oil ages.
    Cheers
    Tombie

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  9. #9
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    Quote Originally Posted by rick130 View Post
    Way too heavy.
    The t/case only needs an xW-90, especially with the ATB, preferably a 75W-90 as oil feed holes aren't huge.
    How about this oneÖ
    1999 build D2 TD5 AT, Mantec snorkel, 2" LRA spring lift, ARB on board air, CMM air ram CDL shifter, swag & gold pans .....

  10. #10
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    That would be better suited for your diffs...Well on the Defender at least.
    Any decent 75W90 will do for your transfer case ... I use either

    The Motul can be hard to source...
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