Looks like the front pinion seal is leaking and has been for at least weeks.
What is the fluid level in the differential? Hopefully the diff. isn't damaged but the "clunk" noise is not a good sign.
Al

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2007 Mini Cooper 4K miles
1993 300E 2.8 120K miles
1961 Morris Minor 42K miles
1965 Morris Minor 23K miles
1997 Ford F150 235K miles
1987 Ramcharger 202K miles
1984 Chevy C-30 farm truck 88Kmiles
1968 XKE 59K miles
2001 Harley Softtail
2003 Harley Roadking