I just replaced both front wheel hubs on my 03 AWD yesterday. I live in a climate with harsh winters, and corrosion IS an issue.
ignore the nonsense in the manual about removing the steering knuckle, not necessary.
you have to remove the ABS wheel speed sensor, as it sticks down into a notch in the wheel hub, and the wheel hub won't come off with the sensor still in place. In my case, the 10 mm headed single bolt was rusted in place, which heat and penetrating oil thankfully solved, but teach sensor was absolutely frozen in place in its hole on each front wheel assembly. I couldn't get them out, until I resigned myself to drilling each out, and the buggers are expensive. Really stupid design. I then overdrilled the sensor hole, and will pack the new ones back in place with liberal antiseize compound.
There is nothing holding the wheel hub assembly in once you remove the 4 bolts, and the axle nut. Rather, all that is holding the hub assembly in is corrosion. I tried a 3 pound, then 5 pound, slide hammer, trying to shock the hub assembly loose. Then I tried putting one of the 4 bolts loosely back in and wacking on it from behind with a punch and a hammer. Sucker didn't move. I finally resorted to a 3 pound hand sledge, turned the wheel as far to one side as possible and went at the edge of the hub from the inside of the wheel well front side, ignoring the damage I was doing to the front tabs of the sheet metal rock guard. The harder you hit the darn thing, with as much weight as possible, the easier the process will be for you. The hub only has to move outwards maybe less than a half inch to come free. The hub is not going to be re-used, bash the sucker as hard as you can.
you could also go the extra step of removing the entire steering knuckle, would give you better working access to the back of the hub I suppose, but not necessary.
I have been getting all my parts from World Parts Express, the Online Superstore for All Factory Auto Parts and Accessoriesgenuine OEM NIssan parts, come in the Nissan packaging, for lkes than a third of the price of my local western Canadian dealer even after Canadian to US dollar conversion and shipping and duty, I have been really pleased.
I REALLY wasn't happy about having to buy a pair of brand new ABS/wheel speed sesnors just to change out the front hubs/wheel bearings. There is a post on this forum somewhere of a fellow who cut out an open notch in the back of the hub to be able to leave the ABS sensors in place when the hub is changed, I think you would have to pull the steering knuckle off the car to get access to do that modification....
on my car, everything in the front end went at once at just less than 100,000 miles. I replaced both lower control arms( bushings and ball joint were toast), tie rod ends, wheel bearings/hubs (front left was crap, but replaced both sides), and I have new KYB struts on order as the struts/strut top mount/strut boots are all crap as well. Parts cost over the Internet including the KYB strust on order have been a third or less of dealer cost, and I have done all the labour myself, so my total parts cost will be only slightly less than $1,000 approximately by the time I am done, for what I was quoted $2,750 from the dealer parts (control arms/tie rod ends/wheel hubs/front struts/ABS sensors)plus roughly a further $1,000 labour, plus tax and shop supplies, would have been close to $4,000 for a vehicle that isn't worth more than $10,000 max at this point.
I bought my 03 new, and will drive it tiill it dies beyond economic repair, but this latest go round of maintenance has been an eye opener, Truly stupid design of the front suspension and front drive from a cost efficient maintenance perspective, I doubt I will buy another Murano as a result, too frigging expensive/time consuming to repair, and at less than 100,000 miles, ridiculous from my perspective compared to the other vehicles in my household.