It has been almost 5 years since the last time I removed an E-Brake band from a t-case while it was in the truck. So, when Agengr was over today working on his M715. I was kind of at a loss for helping him change out the band. I called Pistolnut who changed his out a few times a year or so ago. The first thing he tells me is "Hey, I called you to find out how to do it" I told him that I remember that, but can't remember what I told him.
What I told him last year and what he told me today is also what worked. The J-bolt will come out if you push it toward the front of the truck and toward the passenger side a little at the same time.
Having a long punch and a hammer doesn't really hurt either. It is a very tight fit, but it does come out without raising the cab, cutting a hole in the floor or unbolting the T-Case.
Just wanted to pass this along since this question comes up every few months and I haven't seen it in a while.