PS
If you look at the large fence that goes within 1/8" of the differential .... it's not very far from the vent hole .... also the Jag cover in my photo show's a small fence around the vent hole ...but that is not enough shielding of the vent hole to go on a race track.
And you can say that
oil can drain back in the the rear end from the catch can.... but it should never get there in the first place.... if it does ... you will run the diff dry or low on
oil and severely damage the bearings and seals.
The
oil needs to stay in the rear end and lubricate the componets even when you are thrashing around a race track.
I'm just saying....
