The timing belt on my '96 B2300 broke at 195,200 miles. The 2.3 is a non-interference engine and a broken belt isn't a disaster. However, it was darn inconvenient that it broke in the middle of a very busy intersection. If you plan on keeping your truck very much longer, its likely that the belt will break sooner or latter. I would recommend replacing it at a time and place of your choosing rather than waiting for it to break on its own.