Advice - difference between Shaeffers #267 and #741 Rear End Oil

[outrun]

This is for a 1998 Camaro 10-bolt 7.5inch Auburn Limited Slip rear end.

I am trying to find something that will help maintain max fuel economy and diminish the mild whine in the back. Hopefully the oil will contain a moly and PAO/ester package.

Any recomendations. People here do cite the #267 as most common. However from shaeffersoil.com site it lists #267 as a 80W90 and the #741 as 75W90.

And finally suppose i do order the Shaeffers product do i still need to buy a bottle or two of the GM Limited Slip additive?

(The manual recommends 75W90)

Thanks!

 

[BOBISTHEOILGUY]

741 doesn't have moly in it. It is nothing more than a basic synthetic style gear oil and will need the limited slip additive. It was developed for the warr issues of eaton and such mainly. The 267 on the other hand, normally doesn't but on occassion and only slight occassion will. The 267 also has the climbing ability as the 741 doesn't. The 267 has the moly 741 not.

 

[MolaKule]

quote:

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The #741 has a wider viscosity range since it is about a 90% PAO based product with Moly and other AW/EP additives.

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quote:

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741 doesn't have moly in it. It is nothing more than a basic synthetic style gear oil and will need the limited slip additive.

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Interesting -and I stand corrected, but the older 741 MSDS (before Schaeffer's removed the one with more info) showed moly and ELCA, the latter
being penetro or "climber" additive.

[ May 07, 2003, 10:16 PM: Message edited by: MolaKule ]

 

[MolaKule]

The #741 has a wider viscosity range since it is about a 90% PAO based product with Moly and other AW/EP additives.

My thinking is order the #741 and see if the Auburn makes turns without chattering.

Personally, my view is that the GM additive shears too quickly to be effective in Auburns. This froma guy who had an AM Auburn in 3.42:1 10-bolt Suburban diffy.