I have the poison spiders. They are the same just with a different logo. I filled the back to the specified amount and the front I put extra. I didn’t get ten miles before it was stinking like burnt oil. It was coming out the breather and spraying on to the exhaust. The differential can get rotated slightly after installing a lift so it is a good idea to use the illustration that ronjenx has on the post. You can use a string with a small split shot sinker (used for fishing streams) on the end. Know the distance it needs to go before you put it in to measure. stop at that point and if it is full it will have gear oil on the sinker. If ot add some more.

 

With my front Riddler on my D44 I put in 1.4 Qt plus additive and on my rear with a OX cover I put in 2qt plus additive. Hope this helps..