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  1. #1
    Join Date
    Nov 2012
    Location
    Lanarks
    Age
    64
    Posts
    629

    A palaver - Jag IRS removal

    Anyone else find it an issue with the XJS rear axle on the Cobra kit?

    Inner fulcrum tubes nuts submerged/hidden
    in the rear chassis long tubes?
    Dropping the diff requires removal of the bottom arm nuts/shafts/washers.
    I see some cars don’t use a bottom plate to support
    the fulcrum bracket castings.

    Those smart old timers/engineers designed a simple
    Lightweight cage that dropped the lot out with ease.

    Drop the chassis over the Jag IRS


    Bolt in the diff with bottom arms attached


    Tie plate to cage it all together

  2. #2
    Join Date
    Jul 2012
    Location
    NW England
    Posts
    615
    Quote Originally Posted by drammyboy View Post
    Anyone else find it an issue with the XJS rear axle on the Cobra kit?

    Inner fulcrum tubes nuts submerged/hidden
    in the rear chassis long tubes?
    Dropping the diff requires removal of the bottom arm nuts/shafts/washers.
    I see some cars don’t use a bottom plate to support
    the fulcrum bracket castings.

    Those smart old timers/engineers designed a simple
    Lightweight cage that dropped the lot out with ease.

    Drop the chassis over the Jag IRS


    Bolt in the diff with bottom arms attached


    Tie plate to cage it all together
    On the GD there are angle brackets which bolt to end of the fulcrum pins front and rear, these then bolt onto the chassis which "wraps" over the diff' which also has a mount for the 4, taper seat, bolts at the top of the diff. Not too different from your diagram. Easy enough when the body's not on.

  3. #3
    Join Date
    Oct 2018
    Location
    Shipston-On-Stour
    Posts
    454
    Interesting. Yes, they are a total pain to get out. I have to take the fuel tank out of mine too. None of it easy without a decent lift. All heavy too. Then getting those four bolts back in on the top - aaaaaaaargh. Thankfully, it's not something you have to do too often.

    But there again, if any of us wanted an easy life we would be buying something other than a cobra!
    Dax with 1964 Dual Quad 427 and Toploader box

  4. #4
    Join Date
    Jan 2006
    Location
    Chelmsford Essex
    Posts
    1,518
    The Dax does not use the bottom plate for the XJ/6 and XJS donor but a spreader plate at the rear joining the two fulcrum shafts for support.

    To remove the diff you do need to drop the fuel tank to give you access as you need to pull the diff further back before it can be dropped.

    Making up a cage out of wood helps to support the nose of the diff stopping it twisting and using two trolley jacks.

    I am not sure what benefit would be achieved if the original Jaguar cage support was used as it adds a lot of weight and is bulky so fabricating a support on the bottom plate might give you less ground clearance.

    The diff rarely needs to be dropped, only for brake callipers or diff overhaul work. Access and inspection holes give you access for most jobs brake pads or handbrake adjustment.
    I fitted a remote bleed nipple take off to make brake bleeding easier.
    Dax 351 Cleveland T5 2.88 PL

  5. #5
    Join Date
    May 2004
    Location
    STOKE ON TRENT, U.K.
    Age
    55
    Posts
    10,182
    You could just undo the nuts on the front of the fulcrum shafts, and the 4 bolts in the top of the diff and the shock bolts. Then wriggle it back by around an inch and a half then lower the whole lot down.
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