Sorry for the delay. PM Received and replied.
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Check out this video. It sounds like this may have happened to your transfer case. From about 1min is related to the LT230.
Why do Land Rover transmission units fail? - ask the expert - YouTube
Look into their Torsen type(limited slip) diffs for the centre.
It allows you to not have to lock it up in low grip surfaces and still gives good front/rear traction, AND also has the ability to lock it up as per the normal LR manner.
Look under their limited slip diff range, and it's called the Ashcroft ATB.
I was going to do that at some point just after I got my D1(June '16), but a month or so after I got it, a bearing poo'ed itself and I had to keep the car on the road, so just got a replacement T/C without the option to fit an Ashcroft ATB centre diff while I was at it.
Had the TC not ***** itself so early on, I'd have had the ATB for centre (and both axles)ordered and fitted late last year.
This plan will now have to wait till surplus $s flow back into the bank account! :D
Just some ideas to think about.
What I keep forgetting is the big difference in wheelbase between a 130 and, say a Disco.
That makes a massive change in chassis response, let alone the differences in springs, dampers and anti-roll bars, tyres, etc.
A longer wheelbase is more stable when going fast, responses are 'slower'.
I might find the Disco too twitchy with the centre unlocked too.
Or I might have more fun... :D