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just a quick look at the aura, and I'm going to say the transmission will not bolt straight up. GM did bad things with certain engine lines, like the one in your '04 impala. I'm assuming you have the 3.8? yeah, you'd think the older, lesser 3.4 or 3.1 would utilize a similar block, but it doesn't. All 3 use different transmissions (although I think the 3.4 and 3.1 can interchange).
Always wondered why they were floundering, now I know.....
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