Ihave a 90 RS with a 3.1 and a stock 3.23 non posi rear end with drums. I have a chance to get a 3.23 posi rear end with drums from an 85 Iroc.Will the posi help a lot?Is it worth it? Or should I just keep the non posi. Thanks

Oh,by the way,both cars are automatic

Keep the non posi.
It's cheaper, for right now.
You want atleast 3:42 or better.
Why not step up & just get the whole set up?
I know, cost. But, ya already got what ya have (and spending effort for the same thing axle ratio) & that's not a bad compromise

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

Ill eventualy do what your thinking about doing.
Theres nothing like lighting up bolth the tires for everyone to see.

I'm the same thought.
But, now I see powertrax units going for $450.
Ouch

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA