For the last few months, I have been having a random (different times and weather conditions) a grinding/squalling noise coming from underneath the truck. At the beginning it would last a few seconds then go away, but today it went on for at least 10 minutes. At first I thought it was the transmission now I am not sure, any thoughts before talking to the mechanic. I have a 04 f150 with 69K miles.

 

If your truck is a 4x4
It could possibly be your IWEs in your hubs and or the IWE actuator solenoid located on the fire wall....
if your truck is a 2wd
it could possibly be the wheel bearings...

search results>>>https://www.f150online.com/forums/se...archid=4223517

 

I would say that possibly one of your catalytic converters is about to go. I had an awful grinding type sound under my truck for about a couple of months, then next thing I know, lack of power and my truck is barely going 25 on the interstate at full throttle. One of the plates in the cataytic converter came loose and clogged it.

 

hmmm... that would be a good name for a club... "Random Grinding"

 

better get a big patch on the back of a leather jacket hat says "random grinding" haha