Rear diff fluid type and brand with lsd

I am swapping my rear diff this weekend it is an open diff and I’m putting in a lsd, i went to my local auto parts store and they don’t have a lot of options for diff oil
I saw someone say they used Lucas 80w-90 does that oil have the lsd additive already or should I add some?

 

Lucas 80w-90 does the trick. I've tried Mobil1 synthetic

$39 75w-90 GL-5 Limited Slip, Ultra Long Drain 500k Miles, Manual Transmission, Gear/Differential Lubricant (1 Gallon)

75w-90 WITH the LSD additive, but still had chatter. The Lucas does NOT have LSD additive, yet it performs without chatter. Don't try to understand why...just do it!

 

Lucas Dino(non synthetic)

 

https://www.lucasoil.com/product/heavy-duty-80w-90-gear-oil/

 

This forum is the shit it’s my favorite thing thank you guys answered my questions perfect

 

I made the same mistake. Only, even with M1 and damn near a whole bottle of additive, I still had a little chatter.

Purged it, blasted in some Lucas 80w-90, zero chatter ever since. No additive. No bullshit. It just works.

 

Preach to the heavens!





The only one I didn’t have problems with was redline and maybe some additive.

 

I've seen several reports Valvoline's Flexfill Advanced synthetic bags work. And Amsoil Severe Gear. But honestly, I like Lucas products, and I'm cool with dino juice, so I won't be putting anything in else in my LSD rear.

I got burned once. Not interested in wasting money. Just grateful I reached out the M1's support team, and they were kind enough to refund me for brand new oil I had to dump out.

 

I used Motul 90PA LSD oil. No problems, but had to order. Not going to find it in any stores.