I've been chasing a noise that sounds like its coming from the front differential. Basically its a "hum" that seems to show up at about 40mph coasting thru right turns. Well, with the snow today, I had the noise pretty much continuously with 4x4 hi engaged. I'm thinking the front differential needs a bearing or two. Anyone have recommendation near Bethesda or Chevy Chase (Montgomery County)? Thanks.
The truck has about 91k on it. It's a '97 with the 4x4 shifter on the floor (not electronic). As far as I know, the hubs engage automatically (in the front differential) when I throw the lever. I'm sure that the 4x4 is engaging, checked it in the snow last night.
That's exactly what I thought. But, I've changed both front hubs and both rear wheel bearings. There was a post in the '97-'03 section that sounds like the same noise I have and the guy is pretty sure it's coming from the front differential where the CV shaft flange mates to the diff flange.