94 toyota pickup transfer case leaks while in 4x4
 

I have a 94 toyota pickup 3.0L DLX 4x4 automatic and the 4x4 used to work fine but now when I put the truck in 4wd all of my transmission fluid comes out of the transfer case but it doesn't leak at all while in 2wd. I took it to a mechanic and he said something about the seals being shot, I would take a picture but I don't want all my transmission fluid all over the place. also when it first started happening my hoses were blowing off but I tightened the clamps and I Don't have that problem anymore. Any help would be appreciated