What is the strange noise that I hear in my truck that is in and out sound like whirring ? I have had my mechanic look at and hear it and he determined that it was the front differential but it turns out that is not the solution. This has been going on for over a year. At first it was only heard at high speeds but now it is even heard at low speeds . It is like something breathing hard.

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: 2000 dodge ram 1500 on a 4:10 differential witch transsmition use

I got the info on page from a dodge ram parts seller but I forgot the enet address sorry, any ways thanks a lot.

SOURCE: noise in transfer case or front differential

i had the same problem.. it is the vacuum switch on the transfer case. the switch is stuck open and supplying vacuum to the vacuum diaphram under the battery box. the switch is located on the upper side of the transfer case ( not the front differential) which is located driver side of the transmission. the switch cost me about $25.00. I replaced it myself. if you do your own mechanical work you can get it done just be patient.

Marvin

• 85242 Answers
• Posted on Feb 15, 2009

SOURCE: differential making annoying whirring sounds.

this noise is caused by the pinion bearing in most cases, of course without removing the bearing to look for pits in the race it is at best an educated guess.

SOURCE: Front Differential Noise

Did you ever change a fluid in your front and rear differential?