Rear axle fluid change

[SuperTodd]

I noticed the owners manual says if doing a lot of towing to change rear axle fluid at 24K or something similar to that. I'm almost at 19K, and was wondering what you guys recommend. (mileage wise) I have the limited slip/antispin rear end 3:55. I have looked at both vavoline and mobil synthetic rear axle fluid and they say for limited slip. Just wondering what limited slip additive I need to add?

 

[jdn112011]

I Used Mobil 1 that states it has additive already but I still picked up the mopar friction modifier. I have a write up for the full rear differential service here
https://www.ecodieselram.com/forum/threads/rear-differential-service.741/