I replaced all my drive shaft u-joints a couple of months ago. Yes, front and rears were replaced. Now, I am hearing a noise that sounds exactly like a u-joint going bad. It is coming from the front drive shaft at what sounds like the #1 or 2 u-joint up at the t-case. I greased them all up, and the noise was still there. So I pulled the drive shaft out, locked in the t-case (pesky irritation of a full time t-case) so I could drive it, and the noise disappeared. I have been running it for a few days like that (since Sunday afternoon). I am replacing them tonight, but my question is, could I have damaged my t-case? It doesn't make any funny noises or shift hard, but is running it like that for short durations ok? I drive about 10 miles on the freeway to work and back, other than that, the rest has been local neighborhood stuff, nothing over 40 mph.