grinding in front end
The noise is always there, but when in auto 4 wheel drive the noise is much much louder. Its doesnt
seem as loud when in full time 4 wheel drive. When turning there seems to be no difference in the sound
Sounds to me like a Wheel bearing is bad.
Id have to say transfer case. Disconnect your driveshafts from the axle end and spin them to make sure it is/isnt your t-case. Wheel bearings would not change the sound they made wether the truck was in 2x4 or 4x4
Since you have a full time 4wd option, there should be a locking center differential. Transfer case and wheel bearings would probably make the same noise in part-time and full-time 4wd. I would bet on the center differential. No master what it is, removing the front shaft would probably make the noise go away, but get it to a mechanic soon.
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