I haven’t tried any aftermarket cover other than the Ox covers for the lockers. That’s said if you change the rear cover you will need to install the baffle for the breather vent. The jeeps have the vent on the tube, the Roxor has it on the pumpkin and a baffle built into the cover. Without the baffle the ring gear will sling oil into the vent and you’ll burp oil as it gets hot. after the regear mine was still burping oil even with the baffle. I extended the vent line higher and the oil dripping out of the vent stopped.