You will have to add it through the dipstick which is a long and messy process if you don't add a vent. To add a vent you just drill and tap a hole in the to of the case, then you can either thread in a barbed fitting and attach a hose to it or you could simply leave it open until your done filling it and the put a bolt in it to seal it up. Another method that works well if you don't want to drill the housing is to drill a hole in the top on the rear cover, then you can weld a nut to the inside and plug the hole with a bolt when it's filled
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