Differential Lube addative?

[Ccmano]

I'm about to swap in the new 4.10 pumpkin next week and getting all my misc. supplies ready.

I've read that the new synthetic differential lubes like Mobile 1 and Amsoil do not require the clutch addative from GM? Can anyone confirm this? Any experience out there of running these lubes without the addative? Or should I just play it safe and get the stuff from GM.

Any special gasket cement for the cover or will RTV work?

Any other tips?
Thanks
:happy1:
H
:cheers:

[rebelz]

On the Mobil 1 web site, it says that their LS 75W90 gear oil contains friction modifiers for use in limited slip differentials... I used the lube, I added a bottle of the GM stuff when I did the service last spring. No issues, 12,000 miles normal & spirited driving, including drag racing and autocross.
The other one I can't speak about, as I don't know.
Rich

[Pete]

Hans,add the additive (1 bottle)
Last year i went with Amsoil and they also mention no additive needed but it did,the rear end was crowling for it :) i put in one bottle and all is quiet again.

Now i always have it on hand,come by and pick one up.:-D

Oh i forgot you moved away far far away.:hello:

Pete

[Jagdpanzer]

I also use the Mobil 1 synthetic rear end oil and the GM additive.
Not sure if its really needed but felt it wasn't worth the gamble nor did I want deal with hassle of putting it in later.

[flyin ryan]

I used GM's Dexron, no additive.

[xlr8nflorida]

I also use the Mobil 1 synthetic rear end oil and the GM additive.
Not sure if its really needed but felt it wasn't worth the gamble nor did I want deal with hassle of putting it in later.

I have Mobil 1 as my rear end oil.

Gordon K. suggests 2 bottles of GM additive.

Per Mobil it should be fine with no additive however, I added 1 bottle in my car.