My automatic hubs have started locking in at unoppertune time, like in traffic, which wouldn't be so bad except for only one tries to do it. Anyways I've just about had it and I'm going to change them over to manual hubs. I really hate to do it, I mean who really wants to get out in the mud to lock them in, but I have a lack of other options. I have two questions for you guys. First off, which hubs should I look into mile marker, or warn. I've looked at prices on both and the MM premiums are about $40 less than the Warn Premiums. Are the Warns really worth the $40 extra bucks. What kind of warranties do these things carry. I search the net and all I could find is that autozone offers a 3 month warranty on the MM's. I found nothing on the warn. Question # 2, Has anyone ever noticed vibration in the front end that was causes by the hubs. I had my blazer flood out on me today, and when it was rolling back into the drive I felt alot of vibration, like a grinding, that was coming from the front end. Its not like the noise it makes when one hub tries to lock, it more like you can feel the hubs, or something else rotating and grinding, or maybe bumping as it rotates. Thanks for the advice in advance. I know that this has probably been cover before, but the search feature wasn't working when I tried. Thanks again.