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What gear oil for 12 bolt?

This is a discussion on What gear oil for 12 bolt? within the Drivetrain forums, part of the LSx Technical Help Section category; What is the best gear oil for a street driven strange 12 bolt. it has posi so i know i ...

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    Member wesTXwitesnake05's Avatar
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    What gear oil for 12 bolt?

    What is the best gear oil for a street driven strange 12 bolt. it has posi so i know i need 2 bottles of gm posi additive. But what do you guys think is the best brand/weight for them and how much will i need?
    00' ws6, custom paint, bolt on's and bolt in's.. http://www.fquick.com/garages/viewvehicle.php?id=11454

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    stab it and steer it!
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    i would use like an 85-140 high grade(synthetic) type lube. like Amsoil or Royal Purple. if you are track only, then you can get by with a lesser viscosity. although i would purchase same brand additive as the lube, the stuff you have will probably be fine.

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    Member wesTXwitesnake05's Avatar
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    Quote Originally Posted by 99RedRagtop View Post
    i would use like an 85-140 high grade(synthetic) type lube. like Amsoil or Royal Purple. if you are track only, then you can get by with a lesser viscosity. although i would purchase same brand additive as the lube, the stuff you have will probably be fine.

    I read in another thread somewhere that it wasnt a good idea to use synthetics with a posi unit? Maybe an 85w-145 nonsynthetic with the posi additive?

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    99 Z28 SS convertible

    yes, non or semi-synthetic will be fine, also.

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    Senior Member INMY01TA's Avatar
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    Neither Strange, Moser, or Eaton recomend syn gear oil for their Eaton posi's. Just use a dino gear oil. It will hold just under 2 quarts.

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    Member wesTXwitesnake05's Avatar
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    the chevy house reccomended 85w 90 for 12 bolts, strange said the same. so i guess thats what i should run. i just wanted to see what everyone else was using and which was best. thanks for the info guys oh yeah... and will a heavier weighted oil help deaden some of the gear whine?

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    Veteran 0rion's Avatar
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    don't forget the friction modifier

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    Veteran Hi-Po's Avatar
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    syn. is a no go for the rear.

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    Member wesTXwitesnake05's Avatar
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    Quote Originally Posted by 0rion View Post
    don't forget the friction modifier
    what is friction modifier?

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