T-case leaking after driveshaft swap?

[hidesertwheelin]

First of I have 90 Suburban w/ a 700R4. I just installed my HAD rear driveshaft w/ a slip yoke (ya I know, but I got it from a CK5 member cheap). Now it leaks. The t-case fluid is running down the slip yoke and then dripping? How do I stop this?

 

[4xcrazy]

replace the seal,,i found this usually happens when you remove the driveshaft, not sure why, but the seals are only a couple of bucks.