Specific to the RRIII Diff issue (actually the diffs are fine!)
Just spotted this in the RR forum and thought it worth sharing. It's and aftermarket Pinion doofer my Ashcrofts to get around the stupidity of landrover not a) designing the prop right in the first place (now sorted on newer modles) and b) not selling this part but offering only a whole diff at around £700!!!!!
Lee D