So I purchased a boss 302 diff cover from south Florida parts. And I didn’t realize there was a breather port on the top of the cover. Am I able to plug this or do I need to add a breather vent???
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You can if your axle tube vent is working well now and not leaking. The axle tube vent usually becomes a problem once the car is lowered with 3” over the axle exhaust. For a car that sees the track, you’ll want a diff breather can to prevent hot diff fluid coming out the vent. I would recommend adding the breather can while your changing the cover - the penalties for venting issues is a leaky vent, or a blocked vent that blows out axle seals.So I purchased a boss 302 diff cover from south Florida parts. And I didn’t realize there was a breather port on the top of the cover. Am I able to plug this or do I need to add a breather vent???