I've got a 79 nova, hasn't been on the road since '98 and last week first time driving it since spending 4 years rebuilding it. Was told it used to drag at a local 1/8 mile. Axle seal started leaking so I'm gonna replace bearings and seals and when I popped the cover off I found this clip in the spider gears. Gotta get it out to drop the C clips but I can't find any info on it and I havent done much with diffs before. It's got 4.56 Richmond gears and its posi.