JUST INCASE anyone else was wondering about my question ^^^, I found my answer....as stated for the TeraFlex Rear Disc Brake Kit For 87-06 Jeep® Cherokee XJ, Grand Cherokee ZJ, Wrangler YJ & TJ
If you don’t want to replace the wheel bearings it is okay to cut a slot in the preload ring and slide it over the axle shaft.
This kit does not work with ABS sensors. You will not be able to install the ABS sensors into the disc brake mount backing plate.
Some factory Jeep® 15” Wheels may rub on the caliper. Do NOT operate the vehicle until you confirm adequate caliper/wheel clearance.
TeraFlex does not make any Disc Brake Kits to fit factory Jeep® axles built prior to the YJ Wrangler, except for the XJ Cherokee axles.
The years between 1987 and 1991 are the dark years where anything is possible from Jeep®, so check the bolt pattern with the drawing before ordering a kit.
Most aftermarket wheels, especially alloy wheels require longer wheel studs when installing this kit. To make up for the thickness of the rotor. Use NAPA p/n 641-3204 for the longer Jeep® rear axle stud.
so take this FREAKIN drum to disc BS