Noise while in 4x4 Hi
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From: PA
Noise while in 4x4 Hi
95 F-150, 5.8/E4OD, 158k.
Today I was driving the truck on snow-covered roads, with the manual hubs locked. I only engaged the 4x4 mode when I was on snowy stuff, never more than 1/4 mile at a time.
At one point I got a bzzzZZZZZ sound from under the center of the truck, which I assume would be the transfer case. It got louder and louder until I cut the 4x4 mode after a couple seconds. I was driving down a level, fairly straight snowpacked road with just light throttle. It stopped as soon as I turned off 4x4 mode. I used 4x4 Hi only a little bit after that.
My fiance had been driving the truck in snow earlier today and she said it did the same thing to her once. It didn't do anything like this last winter.
What's going on? I guess I'll be draining the t/c when the weather warms up, but should I completely stop using 4x4 Hi?
Dave
Today I was driving the truck on snow-covered roads, with the manual hubs locked. I only engaged the 4x4 mode when I was on snowy stuff, never more than 1/4 mile at a time.
At one point I got a bzzzZZZZZ sound from under the center of the truck, which I assume would be the transfer case. It got louder and louder until I cut the 4x4 mode after a couple seconds. I was driving down a level, fairly straight snowpacked road with just light throttle. It stopped as soon as I turned off 4x4 mode. I used 4x4 Hi only a little bit after that.
My fiance had been driving the truck in snow earlier today and she said it did the same thing to her once. It didn't do anything like this last winter.
What's going on? I guess I'll be draining the t/c when the weather warms up, but should I completely stop using 4x4 Hi?
Dave
Last edited by dgeesaman; Feb 13, 2007 at 09:56 PM.
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Joined: Feb 2000
Posts: 11,496
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From: Kansas
I wouldn't worry about it. I have left my 4H engaged for miles and you were on a road with plenty of slippage, the truck will have moments where the harmonic frequencies resonate a little more. I expect mine to drone when it's plowing through snow or mud. To me it sounds rather cool. You know she's in 4wd and that is good.
It could be the front driveshaft that needs the u-joints replaced or that you had so much snow packed in the wheels they were out of balance (very common). I would still hold off on working on it until you checked those out when things thaw out and the road is dry dirt.
It could be the front driveshaft that needs the u-joints replaced or that you had so much snow packed in the wheels they were out of balance (very common). I would still hold off on working on it until you checked those out when things thaw out and the road is dry dirt.
Last edited by Ultramagdan; Feb 13, 2007 at 10:10 PM.
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From: PA
Originally Posted by 79oneton
Sounds like transfer case not fully engaged. You must have the electric push button which needs to be exercised much more often.
Is there some kind of actuator/solenoid that engages it? It doesn't make sense to me why it would be engaged for over a mile then start grinding. Unless you're suggesting it wasn't engaged at all up to that point.
Dave
