Steve2286w thinking about your question has helped me solve this problem and watching a few Youtube videos on upgrading Discovery Pinion Flanges to give 4 bolt fixings for the prop shaft. Firstly your point about setting the seal, I did not realise the double lip seal should be driven into the...

The first seal was a double lip seal so it was set correctly proud of the diff casing, and I believe was crushed when in use because of the lack of the spacer. I have subseuently fitted a single lip Corteco seal which seams better quality than the double lip, and this sits flush with the diff...

Thank you for your reply. The collapsible spacer is fitted to the Salisbury Diff fitted to some Series 3's, part no 607197 and is replaced every time the pinion flange is removed as you correctly say. My thread refers to the Rover Diff which has or not sas the case mybe a solid spacer part no...

I recently replaced the rear diff deal on my SWB with the standard double lip seal, it failed after 50 miles, even though it was exactly the same as the seal I replaced which had developed a small leak. I also replaced the Pinion drive flange, as that was pitted and fitted a new mud slinger. All...