Hello mibparker: If you are sure the brakes are not the source of the problem? I would check a few other things. If the sound is from the front end area. Look at the backing plates on the front rotor area. Make sure they are not touching the rotors. If the noise is from under the truck i would look close at the drive line u-joints. If the are bad they can vibrate or they will squeak or even tweet. This will increase and decrease wit speed of the truck.
If this helps please rate the information as it helps insure you received the right information. Should you need more help please just ask. Thank You for using FixYa. Roger
Hello mibparker: They are simple to check. You will need to remove the drive line from the truck. The fact that you only have 70,000 miles on it does not matter. Set park brake and block the wheels. Remove the drive line from the truck. Rotate the joints forwards backwards and side to side. They should rotate smoothly. if they are stiff or rough they are bad. They will need to be replaced.
If this helps please rate the information given. Should you need more help please just ask. Thank You for using FixYa. Roger
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I had similar problem with a dried out rubber dust seal/boot on the front end of the rear diveshaft where the spline enters the transfer case on my 2005 4x4 dodge 2500, it squeaked like mad thought at first it was the rear brakes as the sound resonated through the hollow driveshaft, it also had some small cracks in it and only had 50k km on it! good luck
to prevent squeaks and squeals add a smear of grease at the contact points (#3) in the below photo. 
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I thought it might be the driveline u-joints but since the truck only has 70,000 miles on it and I don't pull anything heavy or beat on it I wasn't 100 percent sure that that was it.
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