Sjwarden

I made a video that might help. With wheels turning you can see the diff turn. e7d68373bbfc918c574327ab0b40bb36.MP4

Ok, reviving this thread a bit. Thank you for all the help so far. In an effort to nail this down so I don't accidentally put the wrong oil in and ruin this diff I got some more info. I took the suggestion above and purchased a camera probe with light. Got the attached pics of the external diff housing and some of the inside. This inside pics are terrible so not sure anything can be made of them. Outside appears to be Ford Sierra diff as mentioned. Also, if this helps, when jacked up and rotating one rear wheel, the other wheel also turns in the same direction. Diff oil appeared nice and amber and clean, but I assume that is because the car hasn't been driven in about 2-3weeks. Diff drain/fill plug was a 10mm Allen and it was magnetic. There was a few black metal filings attached on the inside magnet that I cleaned off. I might try and get a few more pics of the inside and push the camera deep into the oil, but I thought this might be enough for a firm opinion on diff type.

Thank you all for the suggestions and advice. I did go ahead and buy a boroscope, should come in handy. I did also check the rover assembly manuals and they refer to the owners manuals for the oil specs. I found an owners manual that seems close in year to mine and I think in combination with a boroscope to verify the diff type I can nail this down. Also might send away for an oil analysis as coffee break suggested.

Been lurking on this site and dreaming of a Caterham for years. Finally got one a week ago. Planning on doing some maintenance and checks over the winter, and preparing for a lot of miles come better weather. My new car is a kit that was assembled here in the States in 1999, a super seven K series car with the 1.8 VVC engine and Caterham’s 6 speed gearbox from that time. It is also fitted with an LSD. I have a VIN SDKLDKANSX0010168. Wondering what gear oil I should use to top off the diff in this vehicle but I cannot figure out what type of LSD it has. Does anyone have any ideas? Unfortunately the VIN plate has no info other than the VIN number on it. Thank you for any help or input.