HI, when I start out after starting car I am hearing a slight grinding noise like if the axle spindles would not connecting correctly into each other and clicking a bit. After I get going, it ends for the most part. After I start to apply brakes and stop it makes a little bit of the sound again then stops when I put it in park or neutral. Like it wants to keep turning. I changed all the caliphers, hubs, rotors and pads on the car including the cv axles up front. Also tried to change rear differential fluid by taking off cover but could not get the two highest bolts off while having the body jacked up. Started to strip those two so decided I need to take it to a pit I have access to and do it there with more leverage to put on breaker bar. I did re-fill the differential rear by using a pump to take out what I could and then re-fill by taking off the rubber stopper on cover. I never disconnected the battery while doing any of this and never left it out of its 2 wheel drive gear doing everything(have the quad trac system). Is this a mistake and do I have to take through all the gears? Like I said does not do it all the time. Mostly when I first start out. After stopping and starting at a light, does not seem to make the noise agan but I could just not be hearing it. Any thoughts? Only 47 thousand on the car and a lot of rust developed all over under car which I am working on getting rid of.