Re: I have a 2006 Chevy silverado, when it's in 4 wheel...
You need a might new hub internal bearing wiped out the seal goes and grease escapes and then bearing goes check for oil around both left and right hubs or check axle oil level and oil around housing
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most if all problems with the chevy 4x4 at the beginning of problems are the electronics the switches they put crap in the truck and wonder why so many problems to anyone whom sees a problem at the start should first and i mean first clean all the contacts on 4x4 switches the two on the dash and then one on transfer case the one inside the dash sits where people sit drinks like coffee then it runs down dash and onto the switch inside dash you need to take it out clean it good i have fixed more 4x4 problems with doing this first you will not hear this from the dealerships they will tell you you need to replace them when all it is that they need a good cleaning i also take the switch on dash apart and clean contacts then the lights work please try contact cleaner first and more times over it will fix your problems
IF you had the rack replaced and did not align it is possible the wheels are so far out that tires are scrubbing road causing noise. other thing could be a wheel bearing i would recommend getting alignment and drive
bent alloy, bent steel rim, broken belting inside of tire(caused from hitting a good size hole). lug nuts not torqued to correct ft lbs, outer or inner tie rods, toe/ cmber out of adjustment. Are the tires wearing? If not, forget the camber/toe
You could have a bad U Joint from your drive shaft. You ca take it to any transmission shop or dealer and have them change both the front and rear U joints. Good Luck oh and when you do have them changed you can order the greasable ones, just to remember to have them greased every oil changed.
I'm having the same problem with my 2006 Chevy 2500 duramax...The humming starts at 25mph and then gets less prominent and then at 50mph it gets more prominent and louder, then at 60mph you can hardly hear it.....I did notice a little bit of leakage where the front axel meets the from diff on the drivers side.
Any suggestions?
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