I want to take the t-case mount off the crossmember while the case is out of the truck. I don't have a wrench that will fit that big bolt. What size is it? Anybody know? FSM doesn't say...

 

What bolt is that? Typically has 4 small bolts that hold it in place, the big round thing is more of a locating piece, does not really come out.

 

Should be 4 12mm bolts..
Like 4crawler said, its more of a big locating thing.

 

Oook. So that big thing in the center isn't what's holding it on? I just need to find the 12mm bolts in there somewhere? Thanks everyone.

OC, how'd your t-case rebuild go (or did you start yet)? My parts get here today.

 

The sit inside the cross member around that big centering parts.
Need to fit a small socket into the holes in the bottom of the cross member to get to them (I swapped mine for allen head bolts):

 

Ok, the photo helps. Thanks 4crawler.