If you are talking about a rear Rubicon 44 axle, then yes it is a good axle and better then the aluminum center section ZJ D44a you were asking about in other posts. But depending on whether your talking about the TJ Rubicon 44 or talking about the JK Rubicon 44 the latter is a FAR superior axle than the Grand Cherokee D44's and even the TJ Rubicon 44. The TJ Rubicon 44 will be the same width as the Grand Cherokee if this is still the vehicle that you're swapping it into, you will just have to slightly adjust the upper control arm angles as they were different between the TJ and the ZJ. It has the same 8.5" ring gear, 30-spline shafts but is non-clip (ZJ D44a has c-clips), comes with disk brakes, and a factory locker. The rear JK Rubicon 44 is a different beast altogether, it won't bolt up to a ZJ as the coil buckets and control arms are way different in their positioning, it's also about 3-4 inches wider than it's predecessors. It's a superior rear axle as it has an 8.8" ring gear, 33-spline factory axles, rear locker and the pinion shaft is roughly 1.6" which is almost as big as a D60 pinion shaft. If you're talking about a front Rubicon D44 then I don't think they compare to the older versions especially if you're talking about the front TJ Rubicon 44...

Fred R.