I'm in the same boat right now.
I start gett'n that little vibration and noticable 'hum' around 35-40mph. If I get up to highway speeds, I'm starting to get a bit of a 'thump' with it :/
I'm having my mechanic check it on Monday to confirm. I'm already putting together a list of all the stuff needed.
I just recently got the EX with 175k, and i've put 10k more on it, and I don't know what the previous owner did (which is likely not much) so I'm looking at about $500 in all new parts including the hubs, seals and new U-Joints.
Figure since I'm gonna have to pull everything off to do the joint's properly - may as well replace the hubs/bearing assembly for the peace of mind.
I'm not much of an axle guy, I know just enough in this area to be dangerous - so can anyone confirm if this 1) is the right kit to get and 2) worth this price?
Ebay - Spicer U-joint and Seal Kit