98 Blazer with 78,000 miles. I can hear a humming at most speeds. I replaced the driver side hub and bearings. The passenger side was done by the previous owner last year. Still hums. I raise the front again to compare sides. Neither wheel has any play in them when I try to wiggle the tire top to bottom. When I take the tires back off and spin the hubs by hand they feel solid.

The only difference is that when I spin the passenger side hub by hand, it is quiet and smooth. When I spin the new Moog driver side hub by hand, I can feel and hear a clicking. When I place my fingers on the front differential I can slightly feel the clicking when I spin the driver side hub. It sounds like the clicking is coming from under the boot. This CV shaft is a NAPA brand that was replaced in 2010.

Is it likely the shaft again? Even though I can feel it in the differential with my fingertips, the sound seems like it is coming from under one of the boots. The boots are dry and in tact. Thank you all for any ideas.

Todd

 

my old 96 had a howling sound once you got above 20 mph. believe someone said it was in the rear end but I dont remember what