RickRolled Posted December 4, 2014 Report Share Posted December 4, 2014 Hey guys I just recently had my tires rotated/balanced. They told me all four were off by acouple ounces. Then the next day as I was driving I started to hear a slight humming noise coming from my front but only when I push on the gas and not at really low/high speeds around 30-50 mph. I figured it was something wrong with the balance, I took it back to the place and they said everything with the balance was great and then they told me it could be one of the tires but they are brand new 420's and I didnt hear thus noise before I took it in. Any ideas on what it could be? Front diff? Its not the tranny for sure so thats good. Quote Link to comment Share on other sites More sharing options...
90zxdriver Posted December 4, 2014 Report Share Posted December 4, 2014 Mine does the same thing. Whine/hum but only when on the throttle and right around 50. I'm just assuming it's the front diff. Now that my fronts hubs have gone bad, it kinda drowns out the diff noise... If it is the diff, I'm not doing it till the truck won't drive anymore. Quote Link to comment Share on other sites More sharing options...
canadianVRss Posted December 4, 2014 Report Share Posted December 4, 2014 Front diff, same here. It's been whining for 3 years now. Quote Link to comment Share on other sites More sharing options...
RickRolled Posted December 4, 2014 Author Report Share Posted December 4, 2014 I figured it was prolly the front dif:(. I guess my truck doesnt like being touched there by strangers lol. Quote Link to comment Share on other sites More sharing options...
Muggs Posted December 4, 2014 Report Share Posted December 4, 2014 I figured it was prolly the front dif:(. I guess my truck doesnt like being touched there by strangers lol. lol, yeah sounds like front diff to me also. Quote Link to comment Share on other sites More sharing options...
RickRolled Posted December 4, 2014 Author Report Share Posted December 4, 2014 Ya its just when I get on the gas gas around 30-45 Quote Link to comment Share on other sites More sharing options...
RickRolled Posted December 4, 2014 Author Report Share Posted December 4, 2014 You guys think a fluid change might help Quote Link to comment Share on other sites More sharing options...
canadianVRss Posted December 5, 2014 Report Share Posted December 5, 2014 Id did for me... For about a hour lol Quote Link to comment Share on other sites More sharing options...
Downeast Johnny Posted December 5, 2014 Report Share Posted December 5, 2014 (edited) You guys think a fluid change might help Fluid change quieted mine down some, (Not completely), for a couple weeks. It did make it obvious that the noise was coming from the front diff. Edited to add; I changed mine using regular fluid, (Not synthetic), synthetic may actually be worth the extra money in this case. (Might buy you more time). I have gone to full synth since having the diff rebuilt. Edited December 5, 2014 by Downeast Johnny (see edit history) Quote Link to comment Share on other sites More sharing options...
RickRolled Posted December 5, 2014 Author Report Share Posted December 5, 2014 Ya im really thinking its my diff. Is it hard to change the fluid? Quote Link to comment Share on other sites More sharing options...
RickRolled Posted December 5, 2014 Author Report Share Posted December 5, 2014 I really dont have time to change it myself. You think a chevy dealership will know how to do it probably. Im always worried when other people are working on my truck. I just turn wrenches all day on aircraft so when I get home I just want to be lazy lol Quote Link to comment Share on other sites More sharing options...
Blown 346 Posted December 6, 2014 Report Share Posted December 6, 2014 (edited) Ya im really thinking its my diff. Is it hard to change the fluid? The easy part is pulling the drain plug and wiping off the magnet. The harder part is putting the fluid in from the top. I used a clear hose that fit over the bottle of diff fluid and went into the fill hole. I had to pour slowly and angle the bottle in a weird position. Once i had enough fluid out of the bottle, I put a small hole in the end to let the fluid flow. Fill it to the top of the fill hole. Once you see fluid coming out its full. While your down there, I would do the transfer case also, if it hasnt been done. Keeping up maintenance will help alot. I have never had a issue with anything other than doing oil changes, alternators, and battery once. If you do the fluid changes, rear diff etc within the mileage GM refers to, You wont have a issue. Edited December 6, 2014 by Blown 346 (see edit history) Quote Link to comment Share on other sites More sharing options...
Downeast Johnny Posted December 6, 2014 Report Share Posted December 6, 2014 I use a pump made to refill an outboard motor lower unit. http://www.amazon.com/s/ref=nb_sb_ss_i_5_10?url=search-alias%3Daps&field-keywords=lower+unit+gear+lube+pump&sprefix=lower+unit%2Caps%2C199 a little slow, (Lots of pumping), but clean and effective. One of the easier maintenance jobs on our trucks. Might take you an hour the first time you do it. Quote Link to comment Share on other sites More sharing options...
tayldss Posted December 6, 2014 Report Share Posted December 6, 2014 if it's the front dif... buy mine! Quote Link to comment Share on other sites More sharing options...
RickRolled Posted December 6, 2014 Author Report Share Posted December 6, 2014 Well I changed the fluid and I can still hear the hum from 40-50 mph only when I press the gas. Any other suggestions? Quote Link to comment Share on other sites More sharing options...
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