00 T4R 4WD gears grinding/buzzing

I was checking in and decided to make a post to see what y’all could think of.

00 4WD T4R


So last night I engaged my 4wd to climb up this hill and the moment I’ve reached the top of the hill, I decided to put my 4wd back into 2wd but instead my transmission let loose and the 4wd started grinding or made a odd buzzing sound. Even in park it would roll back unless I hold the brakes. Now putting in drive, it would still roll back. 5 mins later, it started to run Park and Drive again. What could y’all think of?