I'm having some issues with my FJ62. In first gear it has started making a noise of some kind, like a grinding noise. It seems to go away in second and beyond, but it is definitely causing some worry. Tranny fluid seems to be proper in hot, and I tried to check the transfer case but I don't seem to have the right size of socket (bigger than a 24, but smaller than a 27, can't find the exact size). Should I bring this in to the shop?