I ended up setting the preload using a digital weight scale/force meter onto the input shaft and using a weight that pulled the meter with the same force every time...
Is it true that you can undo the front and rear differential flange nuts to do a pinion seal on these rovers without affecting bearing preload? I am used to my old toyota diffs that had a crush spacer under the flange nut...
I am reading the workshop manual atm but cant quite understand what sets the bearing preload if the flange nut doesn't..?

