Help with a tranny leak on my '87

[TwoFiftyShifter]

So I bought my '87 2500 and have been driving it, but the leak that I knew about when I bought it.... is pretty bad. After driving around and leving it overnight, it leaves a puddle the size of a brake drum on the ground. It 90wt, and I am certain its coming from the tranny. I would just like a diagram to see the different parts between the tranny and transfer case. Can't find that really..... The previous owner put some grey stuff on to try to seal it, but it isn't working..... I'll take pics of it today. Do you think It can be temporarily fixed without taking it apart? I could do it at my house, but I would rather get a quick fix so I can drive it for now..... It's my only vehicle on the road tm. Any help would be appreciated. It's a SM465/NP208 setup btw.