Jeep TSB #03-06-96
Low Ride Height - Sagging Leaf Springs.

It gives a ride height dimension, spring codes and part numbers information for replacement Springs as they apply to your 93 to 96 XJ.

Pdf. attached

 

I have a 1990 XJ with this issue. Where does the TSB mention the applicable years.

 

" Jeep TSB 03-06-96

Make:JeepNumber:03-06-96Title:Low Ride Height - Sagging Leaf SpringsDate:11/1/1996Models:1993-1996 CherokeeSummary:The vehicle may exhibit low ride height at the rear due to sagging rear leaf springs. With the vehicle on the ground, measure the distance from the top of the axle tube to the lower frame sill directly above the axle (See Figure 1). If the distance from the tube to the frame is less than the distance shown, perform the Repair Procedure. Inspect the original spring to obtain the spring code/part number and use the corresponding spring listed in the Parts Required section."Source: https://www.tsbsearch.com/Jeep/03-06-96

Springs have a finite life span once installed and it shortens with use.
If a Cherokee is still sitting on it's original springs, they're sagging at least a little, usually more.