I have a 95 Yukon that I cant get to stop leaking from the rear seal on the transfer case where the drive shaft goes into it. I have replaced seal 3 times the last time I also replaced the bushing and the seal. The truck has a 6 inch rcd lift I had a custom drive shaft made to stop a small vibration when I took off from a standing stop but that was 20,000 miles prior to the leak. I am running a supercharged 383 with 480 hp at the rear wheels, even when I drove very easy the thing still leaked. Any input would be appreciated this thing is driving me crazy.