Re: 1984 Ranger.....not sure the model number...
I believe there should be a hull number on the transom to the right of where the motor mounts. Let us know what it is, and I am pretty sure someone on the forum can help you identify the model number. A picture might also help.
Hull Identification Number
All vessels built after 1972 must have a complete Hull Identification Number before the registration can be processed. Please inspect your vessel for the Hull Identification Number. The HIN consists of 12 continuous characters at least one-quarter of an inch in height, uninterrupted by spaces, slashes, hyphens or other symbols. The HIN will be carved, burned, stamped, embossed, molded, bonded, or otherwise permanently affixed to the vessel.
The HIN on vessels with transoms must be affixed to the starboard (right) side of the transom within two inches of the top of transom, gunwale, or hull/deck joint, whichever is lowest.