Eric Hanson

2007 f-150 6cyl auto 2 wheel dr. 140k miles
Whirling, roaring sound from middle to rear of truck.
the noise is evident at parking lot and highway speeds. The noise is variable and can be played by feathering the throttle. It seems like it is less noticeable under load and climbing a incline. If i place the truck in neutral at either highway or parking lot speeds the noise subsides.
I have replaceball 4 tires with new goodyear street tires. I dropped the trans pan replaced the filter and added fresh trans fluids. I also pulle the rear differential cover checked for wear and replaced with new gear oil. I would love to get this squared away and if any of you guys could point me in the right direction i would appreciate it.

leopold

What condition are the u-joints.

RLXXI

Could also be the center carrier bearing if you have a two piece drive shaft.
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Eric Hanson

I shook the Drive Shaft the last time I was under the truck. It didn't appear to have play in it and it doesn't make any squeaks or really noticeable clunks. I do think if the shaft has some kind of guide shaft bearing that would be a likely culprit since the noise stops when I put the truck in neutral

geqube

Just had my drive shaft replaced due to the U joints being bad. In my situation, there was a very noticeable rattle, almost growl, from the rear of the truck at lower speeds and it would go away when I gave it gas (unless it was in neutral). If the noise goes away when you gas it, then I wouldn't think it's the U joints.

greasyknuckles

as stated earlier if the driveshaft has a center support bearing I would look there first,
shorter wheelbase trucks generally don't have them. next up would be either ring
gear whine, possibly pinion or carrier bearings failing. just taking the cover off to inspect will not get you there. lifting it listening with a stethoscope or screwdriver
or teardown is how to find noises.

chickenwire

A change in your diet?

tdog02

Lube?