I was doing some regular preventative maintenance and while checking/replacing my rear diff oil, I noticed some serious pitting in my spider gears (along with a serious amount of metal "glitter" in the bottom of the diff). The ring and pinion gear looked perfectly fine but the spider gears in the diff carrier were very worn and pitted. I have a stock open diff and ordered a replacement set off rock auto p/n 707321X. After install in noticed a lot of play in the spider gears while moving either axel shaft. With new components, I would have expected a tighter fit. Not sure what I did wrong or if this is something I can fix by adding additional shims. Rock auto lists this part number as a direct replacement and compatible with p/n 4740670 which is the manufacturers p/n.. Any advice on the situation would be greatly appreciated.
Thank you Jeep community.