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stepuptata 02-07-2005, 07:35 PM Mi 04 2500 HD has a slight vibration and Howling noise at 45and60mph. It goes away when I take it out of overdrive. It is 10 times worse when I put it in 4 wheel high. The truck has 8K on it . Any ideas before I take it in. Thanks for any input, Troy. Reineke 02-07-2005, 07:53 PM Mine has it ~58 mph and sounds worse when it is in 4wd at ~58 mph. I think it is just all the harmonic frequencies coming together to make the drone. When you take it out of O/D, it changes the engine rpm's and the frequency. I think that it would take something to absorb or cancel the frequency to get the fix. martydma 02-07-2005, 10:15 PM 4WD is much noisier on this truck, especially at HWY speed than any other truck I've owned. I'm told this is normal for HD. I haven't noticed any noise/vibration in 2WD. I have 25k miles on the truck and do a lot of HWY driving. westwindsdiesel 02-07-2005, 11:14 PM Mine did the same thing the front axle was bad they replaced it and it's gone Scotty Seelen 02-08-2005, 04:32 PM I've had a 2000 3/4 ton 6.0L, 2001 HD 3/4 8.1L and now an HD Duramax. They've all had slight vibration/howling at 55-65mph in 4wd. Nothing in 2wd, though. | ||