Ok, so I recently bought a 98 Disco and I have been going over the whole vehicle trying to make sure to do all the needed maintenance work. I am pretty sure that one of my swivel housings is pretty close to bone dry while the other one appears to be moderately lubed. I have done quite a bit of searching and am about 99.9% positive that LR had gone to grease in the swivel housing and done away with the level and drain plug. I found the fill plug right away but now i have no idea of telling how much grease to add to each housing. Any input would be greatly appreciated. Thanks guys

 

on the same side as the fill plug there is a drain plug. drain all the oil out of both hubs and add one tube to each hub. You will be set to go.
http://www.roverparts.com/Parts/STC3435G.cfm

Walter

 

Apparently 98s and 99s (and maybe 97s) don't have drain and level plugs. I guess you just keep it topped off with grease?