Yep, I'm thinking someone along the way added the manual hub locks, either because there was an issue with the cad, or they preferred the manual locks.

As I remember, all Mopars after 88 became injected. There were some issues with the earlier throttle body injection (86-88) but I thought most of those issues were corrected by 88 or 89. When the system worked, it worked pretty well. Back then, if it had any issues, it was often replaced with a carb & electronic ignition. Gene