OP
Any ZJ Grand with disc brakes in the rear up through the 1998 model year will fit with little to no modification on rear disc brake conversions. Note that early ZJ production had drum brakes so later units will have what you need.
If any modification is needed at most it would be to open the axle shaft opening up with a drum sander on a hand or drill press just ever so slightly when installing these on a Dana 44 TJ axle assembly so that the bearings and seals fit through the opening easily enough. That is the biggest modification required other than the brake lines and swapping parking brake cables themselves. @mrblaine is right about the recommended modifications and what to do about the abutment clips. If you do not convert to run these clips, wear occurs on the caliper brackets leaving groves in the caliper bracket castings themselves. I have had to weld fill and grind several brackets back to original shape over the years because of this if the wear becomes severe enough. Take care to perform the clip modifications and your bracket maintinance will be happier for it.
Keep and use the four longer fine thread nuts & bolts that hold the caliper bracket and dust shield assembly.
Order new bearing retainer plates for a 2003-2006 TJ Rubicon Jeep and replace said retainers on your re-used axles. Again note that you can slot these with a cutoff wheel so that you don't require a press to do axle bearing work if you are careful or need to perform an in the field conversion. Otherwise, this could be a good time to change the axle shaft bearings and seals when changing from drum brakes to disc brake retaining plates.
Order factory or aftermarket TJ or LJ Wrangler (depending on which model you have) parking brake cables for them as a direct swap to the old drum brake cables.
If you can do your own brake line flairs properly and safely, you can cut your factory brake lines and re-flair them to take factory ZJ brake rubber hoses that go from the calipers to the metal hard line. I prefer this over the later one-piece axle brake line assembly with perminantly attached rubber brake hoses for a few reasons; One is if a rubber brake hose from a ZJ fails, just replace that hose. Two is if the hard line is damaged, the segment that is damaged can be replaced separate from the entire assembly as used on later model TJ or LJ Jeeps with factory rear disc brakes. Also another note is some late TJ's had plastic molded over their hard brake lines. This plastic makes it difficult to do flair work when you cut them. Also there is no corrosion resistance to these plastic coated lines like the type with a coiled spring protector over them which are galvanized or plated preventing rust. If you scrape or remove the plastic coating, the brake lines will have no corrosion protection and can start rusting almost immediately. This would be bad in a climate where roads are salted as these brake lines can rust through in just a season or two if not dealt with from the start.
****Anyone wishing to perform brake modifications it should go without saying if not 100% confident in your abilities to perform the work, should leave these modifications to the professionals. Obviously brakes are of paramount critical performance and operational needs and should be dealt with as if peoples lives are at stake here BECAUSE THEY ARE. YOU, YOUR LOVED ONES and STRANGERS ON THE STREET DEPEND ON PROPERLY FUNCTIONING BRAKE SYSTEMS. Take all work you do on brakes with the utmost seriousness please!****
Nuff said,
RR
