Help me determine if my wheel bearing/hub assembly is bad...
Well.. My 99 4x4 Ranger has 150k miles on it. I have had it for a year, so I am not sure if the wheel bearings have been replaced prior to me owning it. I have been double lifted on 35's for, about 2k miles. I have been reading up about wheel bearings.. I noticed on my pickup, at certain speeds, noticeable most at around 20mph or 30mph on decel, or at crusising speed.. kind of a humming type sound. It doesn't sqeal, or grind.. it's more of a humming type sound, maybe could be considered growling as some people put it. I jacked the truck up, and checked for play in the wheel.. there really is none at all, but i know that doesn't exactly mean the wheel bearings are good. I freely spun the wheel while it was jacked up.. and i don't really hear any unusual noise.. it just sounds like any vehicle does... maybe just alittle break pad friction against the rotor sound. I am having a hard time determining if it's just the howl road noise i'm hearing from the KM2's. Also, when i come onto a freshly paved road, black topped street, the humming is quite a bit more noticable. It doesn't seem to do any different while turning or anything.
I figure i'll replace them here at some point... and i know it will be hard to even diagnose from what i described.. but if anybody could give me their input or thoughts i'd appreciate it. And also, When I did my superlift I had to pull the knuckles so I pretty much know how the hub assembly goes in the spindle.. CAN i leave my knuckle attached while replacing the hub assembly?
Thanks alot guys!