When my truck is in 4 hi there is a slight whining noise. I don't know if it is normal or not. My last Toyota did not make this noise. The truck is a 93 Xtra cab V6 with A/T. I changed all the fluids recently and it did not solve the problem. The front diff has only 20k miles on it, the rest of the truck has 127k. Any suggestions? My friend says it's normal for it to whine a little bit. What do you think?

 

mine whines