96 Bronco, 5.8 liter auto locking hubs. Had tranny work done years ago. When I put into 4 wheel drive it sounded like it always did. Yet front wheels not doing anything. When I remove front 3screw hubs. What am I looking for? Worn, or damaged splines ? Was considering switching to Warn manual locking hubs. But I want to make sure that is the problem to start with before manning $300.00 investment that I may not need.