It's not the banging popping, it is the fact that under load they lock. A spool would compound that. If there is no give in the differential, something has to give. They are: the axles (constantly twisting), the driveline (more load on the ujoints and slipyoke), the rear of the transfer case (it will wear bearings and the seals). I have seen this and the only thing to do is to go with a part time/selectable locker. ARB used to be the only game in town but the TRD electric is becoming more popular. There are others too but I have no experience with them.
