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Posi was an option, I think it would have to have the Y87 option group to get a posi.
4.10's will get that thing moving. Auto or stick doesn't make a difference, it is a performance mod designed to get the car going through the traps in a happy part of the power band so that it is pulling all the way through the finish line. They will be almost exactly the same going down the road as if it was a manual, your overdrive will be a .70 and the 5spd was a .67, that will only be a difference of a few RPM even at speed.
-Tim
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