No one has replied, I'll take a crack at it..

Have you tried moving it from 2nd gear(winter)? Engine on?

My guess if you cannot move the car in neutral. Engine being off-it's your transfer case.

More than likely B2 planetary gears, or you had a torque converter failure, but most would say it is B2 as it is very common failure in Pre-2000 722.6 transmissions.

Martin