I own an un-lifted stock 2011 Jeep Wrangler 2dr Sport model. Last June my OEM rear diff. cover was replaced with an G2 Axle and Gear PN 40-2033AL Aluminum Differential Cover for Dana 44 Axle Assemblies.
The rear OEM track bar hits the diff cover when I go over bumps when I'm off-roading or going over speed bumps in the city.
Regretfully I now have switch back to my OEM diff. cover or install another aftermarket cover that has the required clearance.
See image at: http://www.webnameswb.ca/users/4227/...s/IMG_4462.jpg