Humming vibration ,
As I bring my 2001 chevy suburban up to
speed I'm getting a humming vibration that
is continuous and then stops , then starts
again and then stops for a few seconds. Air
is off, but is in working condition otherwise .
Is it possible the power steering pump is
cycling on and off.
Is it from the front or back? Like rear chunk rear end, or axle bearings or is it from the front wheel bearings, or engine area or front drive shaft output bearing, just need more info on where it comes from. Power steering can hum, mostly when turning at slower speeds when real bad, but does it sound like a belt or belt tensioner/puller/idler pulley.
If its rear end gear or transfer case see if it needs gear oil.
The drive shafts (3 of them, Main one to rear and one to each front wheel unless it has a straight axle on the front) can wear out and need new ones, the part going into the trans or transfer case, can hum at first then to a roar and if the rear end or transfer case is low on gear oil may hum then roar as it goes dry then it goes bad and can break or lock up.
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