Hello everyone.
Ive recently developed a chirping sound when stepping on the gas hard only in 4wd Hi or auto. Its frequency increases and decreases as the rpm increases and decreases as it switches gears, and its coming from the middle to front of the truck.
Ive checked the front diff fluid and its fine. I still havent checked the transfercase fluid.
Any other thoughts

Sounds like a U joint or a CV joint. They can't be lubed; you should have the joints checked.

ok, I'll take it to the dealer tomorrow.
I have 60,050 miles on it, do you think they'll cover it under the powertrain warranty?