Diesel Transaxle

Hi:

I just rebuilt my diesel transaxle with the kit provided by Tuff Torx. All went well and it works great but after a couple of days the top seal on the input shaft started spraying oil. What might I have done wrong? I greased everything when I put it together. Do you need to really grease it heavily? Any tips for reassembly?

I appreciate any thoughts before I replace the seal again.