A833 Neutral Issue

Is the ring the brass piece with the teeth?
yes, for this discussion, synchronizer ring is synonymous with; ring, brass, brass-ring, blocker, and blocker-ring, and yellow thingy.
Find the three struts and make sure they are engaged in the cutouts in the brass, all three of them. If they are not, you have a problem See note-1
If they are indexed then;
Find the biggest flat screwdriver you have that fits between the ring and the gear, push it down to move the brass over a hair, move a third of a revolution and repeat. repeat until it pops off.
note-1
if the struts are NOT indexed in the cutouts;
then most likely the brass is bent and will be useless. You can try turning the brass into synchronicity but I think it will not budge. If that is the case for you, then I would take the trans apart and replace that ring.