Thanks I will take a proper look tomorrow. I’m still not convinced it’s not the clutch or gearbox do you know if there is anyway to check without dropping the gearbox out ?
Ok, I've only issue with my T box, but my reading on issues with the box I found lots in the forums (landyzone) etc, plus workshop manuals.
I understand that the external linkage can be reached from below the vehicle, it certainly can with my D1, but for looking inside the box the cubby box and central console has to removed to give access to the top of the box,
then remove a cover to for access to more selector parts.
My first and only issue is I can’t move the selector… it’s seized.
Not a big issue for me, as in the 34 years of ownership with a vehicle fitted with a T box, I’ve use diff-lock only once back in winter of 2012 when there was a bit more snow than usual in my area, so I thought I’d used it, it was great instantly engaging and disengaging when required, it stopped the disco drifting sideways on roundabouts and so went round as if on rails
But since then no hope, I will have to slow down on roundabouts if my part of the world gets more than an inch of snow this year