The seatbelts on my 85 wouldn't retract either. I took them out and wound the springs tighter to help them retract. I wound the springs just tight enough to still be able to pull the seatbelt and lock/click it. Be very, very careful if you try this. This didn't fix the problem completely but they are much better. I also removed the plunger in the door jamb which has a cable connected to it. The cable runs to the seatbelt and is supposed to help the seatbelt retract when you open the door. As far as locking in a quick stop, my 85 had small weights that swing forward locking the seatbelt when the car comes to a quick stop.