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Ok, so after looking up the 4T45E, it appears that the Olds Alero has a different gear ratio than the Grand Am o.O
Apparently the GA has a 3.63 final ratio whereas the Alero has a 3.05 final ratio.
I'm not sure how that would affect the drive of the Alero but I would recommend looking into that.
If you want to keep the "Stock" drive ratio, you have to pull the trans out of a G6 or a 2005-2008 Malibu/Malibu Maxx.
If you want the GA's drive ratio then you have to pull the trans out of a GA (obviously) or you can get it out of the Cobalt, Vue, or Ion. Just depends how you want to do this.
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