It turns out that the posi unit I was going to use is a 7.5 Auburn. One of the side gears is cracked, and they appear to be like hen's teeth. I have new spiders for the open in the car. I always hear people trashing the Auburns, but in the 90s, they were the cat's *ss with the Mustang boys. Are they that bad? I'm certainly not dropping $600 on a new one.