Transmission leak

[McCullough]

So I was pulling this today:



and while on my way to the dump, this happened:




I immediately stopped off at Autozone and put in some stop leak. Haven't been able to get a better look at it yet. It appears to be just a leak, it still shifts fine and it's not making any noises. Hopefully it's just a seal or a gasket. Any ideas?

 

[McCullough]

Well after further investigation, it's the rear main seal. Crap. Anyone know how difficult this would be if I did it myself?