Originally Posted by brendanlush
How do I go about checking to see of the line is plugged? What type of diff fluid should I get if it is low?
Find the vent line coming off your axle, not too sure where it is but it'll be on the top, either on the axle tubes or the differential itself. Chase the vent line to where it's hanging off the frame and inspect it for blockage. You may need to remove and blow through it to make sure. Check your OM for fluid recommendation. I'd definitely check your fluid level before going anywhere though, a dry diff is not a happy diff.