Bought a '97 Blazer rearend to put in my '37. Had new axles, axle brgs and wheel seals installed at the recommendation of a local axle shop. There was not a hint of oil leaking from the front seal. Put new diff grease in it and stored it for the winter with the pinion shaft horizontal. No leakage at all. This Spring I inadvertently dislodged the support that leveled the pinion shaft and within a week there was a big puddle of oil on the floor. Question.. is there an oil tite seal on the pinion shaft or just a felt seal and slinger to keep oil in the diff?? Thanks in advance for some enlightenment.