Guy in Canada has clutches on eBay right now for about $65. I'll post the link if I can figure out how. His user name is sapper00. Be sure to check those part #s though.

 

I was going to suggest the Bias plate and the springs for being unable to shift properly, but I appears there is more to your r380 being unable to shift properly

 

The little bits of friction material were pretty thin so I'm thinking maybe the clutch disk is at the end of its life and starting to just fall apart. Won't really know until I get a look at it first hand. Can't decide if I should just scoot the trans back just far enough to swap it out or come all the way out with it.

 

Coming to the realization that the transmission will have to come out in order to address the clutch issue, I decided to check out the condition of the exhaust flange nuts and bolts. By the looks of them I was expecting the worst. I always use copper nuts when working with exhaust hardware; these were not. So I crawled underneath 'Nigel' (my new hang out spot) and closed my eyes before turning counter clockwise on the ratchet and foot long extension. Sheer joy overcame me when all of the nuts turned freely. The thought of snapped off manifold studs no longer lingers in my mind, those are something I can do without.

 

Forgot to mention, earlier in the day I removed the center console and rubber boot around the shifters to do some vacuuming and become familiar with the work area. Looking down, wedged in the hi-lo range shift linkage I found this little guy (the little shiny circle in the center of the picture)

 

So far so good. After getting home from work and before dinner I was able to get a little done. Removed the exhaust down tubes and muffler back to the tail pipe. Also the rear drive shaft. All this in just under an hour. Plenty of room and because mine is lifted I don't even have jack it. Pretty cool I'd say...

 

does it shift with the socket removed

 

The socket was only in the vicinity of the hi/lo/diff lock shifter linkage; and actually was wedged out of the way so it wasn't really having any effect on that. But, to be honest I didn't even try it after removing the socket. Once I saw the huge pile of clutch material inside the bell housing I figured it had to come out anyway.

 

Agree. Way to much debris in the bell housing.
Separate and investigate, most likely a new clutch among other things.

The long way is often the quickest way.
Thats what i keep telling myself when working on my disco.

 

I haven't had that issue with my Discovery, but i once had your symptoms on a Honda CRX. In that case, one of the springs had popped out of the clutch disc, physically locking it to the pressure plate. Good luck on the repair, let us know what you find out.