i need help with the transfer case

thank you I got it done still hear a noise like a whistling noise i don't know if it is totally fixed i drove from ms. to nc. pulling a u haul tailor when i came down off the mountain it starting acting like my emergency brake was on.. a man inside of mc donalds helped me and said he thinks this was what's wrong.. Gm told me to bring it in to be serviced but i am up in the mountains of Nc. not sure if i can make it back or not crossing my fingers that this whistling noise will go away.. thank you denise