General 4WD Questions - Ford Powerstroke Diesel Forum
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post #1 of 4 Old 12-09-2008, 05:16 AM Thread Starter
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General 4WD Questions

So today was the second time that I have gotten to use the 4WD system on my truck since I bought it last July. I have a couple questions for you guys just to see if this is normal or not. This morning it is in the teens and I had to drive about 25 miles using 4WD in the snow and ice.

My first question is that after about twenty minutes of driving (was doing about 40MPH in 4WD) there was this buzzing sound from the engine bay that sounded exactly like that buzzing sound you get when you turn your idiot lights on and are waiting for the glow plug light to go out before turning the truck over. I am guessing that maybe something was just trying to stay warm in the cold temps while driving down the road?? It didn't stay on but maybe about a minute or two if that.

My second question is on how the truck seemed very sluggish and "heavy" when driving in 4WD and even after turning the 4WD off. Is this normal for the truck to still feel this way even after turning the system off? I can understand why it would feel that way with the system on since all four wheels are now pulling the truck along.

Then the last question I have is if it is going to hurt the truck to have 4WD on for that long of a period (about 25 miles). My work is 30 miles one way from my house and if it is snowy and iced over the entire way I can't see what else I could do but keep it in 4WD and just go about 40MPH but want to make sure that this isn't going to hurt the truck. I just know that you don't want to go over 50 MPH I believe while in 4WD.

I have had other trucks and SUV's but this is my first diesel with using 4WD and just didn't know if there are any sort of concerns with diesels when it comes to 4WD.

Thanks for any help guys.


2006 6.0L F250 CrewCab
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post #2 of 4 Old 12-09-2008, 05:30 AM
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The buzzing you heard may have been the vac pump kicking back on. That is what locks the hubs. As for being sluggish i have no idea, mine feels fine either way
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post #3 of 4 Old 12-09-2008, 05:33 AM
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sluggish feeling could be from the fact you were feeling the resistance from the snow.
Buzzing noise i have not heard while in 4x4 so I'm not sure what your hearing....could be vacuum pump i guess but its surprising you can hear that over the engine?
As far as driving long distance in 4 wheel, keep it under 55 mph and if the road clears up and is not slick take it out of 4 wheel...other than that, your fine.
Be careful though, 4 wheel drive gives a person a false sense of stability and you may tend to drive to fast for stopping condition...4x4 will not help you stop any faster.

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post #4 of 4 Old 12-09-2008, 05:54 AM
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it good to run the 4whl drive lets the front joints get a work out and they wont freeze up on you .he buzz is the vac pump thats what locks your hubs in . prefer the manuel stick on the floor and for the sluggish i dont know on those truck but your front hubs may remain locked in till you back up whitch disengages the hubs
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