It looks like you have a newer DRV. Those DRVs no longer have oil bath bearings but greased bearings. Still not clear even if you had oil bath bath hubs why you would need to drill a hole. From my understanding on the oil bath is you fill it to the bottom of the rubber plug whole. And drilling a vent hole could expose you contamination and moisture issues.
__________________
2016 DRV38RSB3
2015 Ram 3500 Regular Cab DRW CTD Asian trans 410 rear
|