Originally Posted by codprawn
Just remember if there is no diff lock fitted it can be added - all the gubbins were there but LR thought people wouldn't want it with traction control.
Only on some though - some vehicles you just need the lever and cable (early ones I think), others (like mine ... 2002 model) don't have the diff lock guts in the transfer box so it is a more involved and expensive process. Didn't bother as I have this for going off the road:
The "clunk" referred to is mainshaft spline wear between gearbox and transfer box, affects manuals as much as autos (maybe more) but not a problem on anything built after some time in 1996 when the required oil drillings were added, definitely not a problem on most 300Tdi Discoverys and any Td5. All vehicles have a bit of backlash in the transmission if you shift from drive>reverse>drive>reverse especially when hot, this is where taking somebody with you who knows their stuff is important because anybody in the business will know what is normal and what is to be worried about!
IMHO the great thing about the older ones (everything pre D3 basically) is that the major units - engine, gearboxes, transfer box, diffs etc - are more or less the same across the range and cost very little to recondition/replace if required. I could take the transfer box out of a 1985 90 and fit it to my 2002 Discovery, for example. This is both good and bad but it means you are not faced with multi thousand pound bills if something does goes pop.