The information is general but I hope it’s what you are looking for.
JT8D-15.
Same as -11 except 15,500 lb. takeoff static thrust at sea level flat rated to 84oF ambient temperature and other minor altitude thrust increases with the incorporation of improved engine parts.
JT8D-15A.
Same as -15 except reduced fuel consumption by incorporation of improved engine parts.
JT8D-17.
Same as -15 except 16,000 lb. takeoff static thrust at sea level flat rated to 84oF ambient temperature and other minor altitude thrust increases with the incorporation of improved engine parts.
JT8D-17A.
Same as -17 except reduced fuel consumption by incorporation of improved engine parts.
JT8D-17R.
Same as -17 except 16,400 lb. normal takeoff static thrust at sea level flat rated to 77oF ambient temperature, 17,400 lb. maximum takeoff static thrust at sea level flat rated to 77oF ambient temperature and a takeoff thrust reset mechanism incorporated in the fuel control along with improved engine parts.
JT8D-17AR.
Same as -17R except reduced fuel consumption by incorporation of improved engine parts.