Hi guys, I was just wondering if there's an easy way of identifying my diff's ratio without actually removing it from the axle casing because it's sh*ted up and I don't want to get mucky.

put some marks on the shafts, do some spinning and counting and maths?

Should be a small aluminium tag fitted to one of the bolts, its approx 12mm x 40mm long. This has the ratio marked on it.

Hope this helps.