So before I moved up Phoenix a couple of months ago I noticed all this grease on the frame coming from the drivers side couldn't find out where it came from at the time....well today I noticed the same grease on the passengers side of the frame and it looks like the boot closest to the diff leaked out the grease. I drove 165 miles from Phoenix to visit my parents for Christmas, no issues on the way at all. I assume I lost the drivers driveshaft when the grease was all over the frame, but it hasn't given me any issues and any noises at all....I drove today to the park and no noises coming from the drive shafts at all...So I'm leaving back to Phoenix on Monday and I don't have time to change out the driveshafts...what the worse that can happen if I leave them "as is" I assume they are just spinning freely since I am not engaging the 4wd or use it all.