truck makes weird noise in 4low

[Ex95XLT]

when im in 4low and give it gas, something makes a loud clicking noise sounds like its coming from right under the drivers seat. its only in 4low, 4auto is fine, and 2wd is fine too. anyone have any idea on what it is?

 

[Muskrat]

you hight have water in the t--case

 

[Ex95XLT]

that would make a clicking sound? how could i check?

 

[Ex95XLT]

?

 

[Muskrat]

open the fill plug on the case, and see if anything comes out. If it does, drain all the fluid, and replace