Here is what's going on! During acceleration from about 5mph, both in 4x4 & 4x2, she makes a whinning noise, from about mid truck, that increases in pitch and volume as speed increases until around 65mph then whinning noise seems to decrease, but still noticable and constant! Noise most intensive @45-55mph range and completely stops when I let off accelerator and coast and returns every time I give it throttle. noise steadily decreases during braking until gone @ approx 5mph. U-joints seems tight/well lubed and no slopp. Does not seem to originate from rear diff at all/fluid level good. T-case level good/no sign metal flake. Tranny surges a bit into reverse when cold/hard shifts reverse from park/drive when warm. shifting good throughout acceleration/deceleration. All 4x4 shifting/performance normal! Need help tracking this most excruciatingly annoying problem down. I'm a home mechanic w most tools/decent trouble shooting skills! Whats next to test/check or should I just spend the hour labor fee and take it to shop to have tech diagnose?