Year (Make and model if not a Toyota Tundra) cab config, trd package if applicable, mods done to truck, heck even which motor would help my man.
A continuous scratching noise that starts at 20 mph (or kmh?) and continues as speed increases. Does it get louder as you go faster? Change pitch when on/off the accelerator/brakes? My gut is telling me that it could be a cv joint or boot, but the fact that it doesn't change during cornering makes me think otherwise. Where are you located? Even if you don't drive on dirt roads, it still could be some sand from the town sanding the roads you drive one.
I'm Back Jack!
2010 Toyota Tundra DC
5.7l, TRD Off Road, 4WD
Silver Sky Metallic
Gone!: 2012 Subaru Impreza 2.0i Premium
Dearly missed: 2010 Toyota TUNDRA Double Cab
TRD Off Road Pkg. 5.7l iForce V8. Slate Gray Metallic
Flowmaster 50-series muffler / Cat back custom exhaust
HID lights in factory HI/LO headlamps and foglamps
275/65R18 Toyo Open Country A/T