Well today I have had a chance to have couple hours with the car. I put spare on each rear corner, and the problem is still there! Took it to a garage, guy drove it and said “ Think it is your rear diff” we also noticed around the rear diff is a little wet, is this car displaying the symptoms for a rear diff?
I also noticed the rear UJ joint looks all shiny, like it is not very old ( the one nearest rear diff)
I am leaning towards now replacing all the UJS? as I cannot feel any real play in any of the shafts. Am I right in thinking they will be 4 UJ's, do these require any special tools to fit? or is hammer and socket sufficient? :)
Thanks again all! I am sure I will get there soon, and have a chance to enjoy my Landcruiser.