Humming or like smooth grinding.
Two things you want to check u joints at drive shaft and also check your rear end check for play where drive shaft joins to rear end and transmission let me know
SOURCE: 1996 suburban makes grinding noise in 2 wheel drive
sounds like the clip on the rear output shaft its probably broke. do this by removing the rear driveshaft, and the tail of the transfer case, there are 4 bolts holding it in place. then grab the output shaft and see if it has any front to back movement. if so pull it all the way to the rear and you should see a groove at the front part of the shaft where the clip goes. Then you should find the pieces fo the clip in the tail housing. One person said he found the replacement clip at a local tranny shop. I am calling the dealership parts counter for a new clip for my 97 Tahoe tomorrow. Hope this helps..
SOURCE: Humming noise in front end of truck
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?
SOURCE: 02 Suburban Service 4WD light on periodically. Humming
Sounds like CV joint, or wheel bearing
SOURCE: Humming noise between 40-50 mph
I experienced something similar, loud humming/truck like sounds only at highway speeds, turned out I had a cracked rotor.
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I received your answer and thank you for that. Actually I changed the 2 front wheel bearing hubs and the noise stayed as was. i will check your recent answer with my mechanic. One precision: When car dips down due to smooth road unlevelness the noise increases and when it springs back upward, the noise disappears. I believe what you are sayoing makes lot of sense. I will report back. Thanks for your time.
im pretty shore thats your problem let me know thanks
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